[syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    8c2e52ebbe88 eventpoll: don't decrement ep refcount while ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=177cea8c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12e99bd4580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1702c0f0580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-8c2e52eb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fd9c3cb36878/vmlinux-8c2e52eb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0f323b0a9d42/bzImage-8c2e52eb.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/d0ab42c91b28/mount_0.gz
  fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=14e99bd4580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com

(syz.0.16,5478,0):ocfs2_truncate_log_needs_flush:5830 ERROR: bug expression: le16_to_cpu(tl->tl_used) > le16_to_cpu(tl->tl_count)
(syz.0.16,5478,0):ocfs2_truncate_log_needs_flush:5830 ERROR: slot 0, invalid truncate log parameters: used = 128, count = 39
------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:5830!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5478 Comm: syz.0.16 Not tainted 6.16.0-rc5-syzkaller-00053-g8c2e52ebbe88 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ocfs2_truncate_log_needs_flush+0x2d8/0x2e0 fs/ocfs2/alloc.c:5827
Code: 0f b7 00 4c 89 e7 48 c7 c6 35 c0 a6 8d ba c6 16 00 00 48 c7 c1 c0 23 ca 8b 45 89 e8 45 89 f9 50 e8 5d 11 1e 00 48 83 c4 08 90 <0f> 0b 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90002c7f540 EFLAGS: 00010292
RAX: c11493c73e537600 RBX: ffff888031704174 RCX: c11493c73e537600
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90002c7f610 R08: ffffc90002c7f107 R09: 1ffff9200058fe20
R10: dffffc0000000000 R11: fffff5200058fe21 R12: ffffc90002c7f5a0
R13: 0000000000000000 R14: 1ffff11007d6bf58 R15: 0000000000000080
FS:  000055557c057500(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001400 CR3: 000000004f209000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ocfs2_xattr_set+0xaea/0x11f0 fs/ocfs2/xattr.c:3624
 __vfs_setxattr+0x439/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x274/0x600 fs/xattr.c:665
 path_setxattrat+0x364/0x3a0 fs/xattr.c:713
 __do_sys_setxattr fs/xattr.c:747 [inline]
 __se_sys_setxattr fs/xattr.c:743 [inline]
 __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:743
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0edcd8e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd28be2a78 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f0edcfb5fa0 RCX: 00007f0edcd8e929
RDX: 0000200000001400 RSI: 0000200000000240 RDI: 00002000000001c0
RBP: 00007f0edce10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000841 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0edcfb5fa0 R14: 00007f0edcfb5fa0 R15: 0000000000000005
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_truncate_log_needs_flush+0x2d8/0x2e0 fs/ocfs2/alloc.c:5827
Code: 0f b7 00 4c 89 e7 48 c7 c6 35 c0 a6 8d ba c6 16 00 00 48 c7 c1 c0 23 ca 8b 45 89 e8 45 89 f9 50 e8 5d 11 1e 00 48 83 c4 08 90 <0f> 0b 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90002c7f540 EFLAGS: 00010292
RAX: c11493c73e537600 RBX: ffff888031704174 RCX: c11493c73e537600
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90002c7f610 R08: ffffc90002c7f107 R09: 1ffff9200058fe20
R10: dffffc0000000000 R11: fffff5200058fe21 R12: ffffc90002c7f5a0
R13: 0000000000000000 R14: 1ffff11007d6bf58 R15: 0000000000000080
FS:  000055557c057500(0000) GS:ffff88808d21b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001400 CR3: 000000004f209000 CR4: 0000000000352ef0


---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

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If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com
Tested-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com

Tested on:

commit:         552c5071 Merge tag 'vfio-v6.18-rc3' of https://github...
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1684e3e2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb89820a01e5d251
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17ea9b04580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com
Tested-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com

Tested on:

commit:         552c5071 Merge tag 'vfio-v6.18-rc3' of https://github...
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=12f12d42580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb89820a01e5d251
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=156ce3e2580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

im0 netdevsim3: renamed from eth3
[   65.498461][ T5570] bridge0: port 2(bridge_slave_1) entered blocking state
[   65.504458][ T5570] bridge0: port 2(bridge_slave_1) entered forwarding state
[   65.510598][ T5570] bridge0: port 1(bridge_slave_0) entered blocking state
[   65.516333][ T5570] bridge0: port 1(bridge_slave_0) entered forwarding state
[   65.547747][ T5570] 8021q: adding VLAN 0 to HW filter on device bond0
[   65.558428][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
[   65.566437][ T3031] bridge0: port 1(bridge_slave_0) entered disabled state
[   65.573305][ T3031] bridge0: port 2(bridge_slave_1) entered disabled state
[   65.581116][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[   65.590723][ T5570] 8021q: adding VLAN 0 to HW filter on device team0
[   65.605138][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
[   65.617739][ T3031] bridge0: port 1(bridge_slave_0) entered blocking state
[   65.624264][ T3031] bridge0: port 1(bridge_slave_0) entered forwarding state
[   65.632411][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
[   65.641431][ T3031] bridge0: port 2(bridge_slave_1) entered blocking state
[   65.647421][ T3031] bridge0: port 2(bridge_slave_1) entered forwarding state
[   65.665596][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
[   65.675817][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
[   65.688046][ T5570] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network
[   65.699422][ T5570] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network
[   65.712142][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
[   65.719124][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
[   65.726668][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
[   65.743599][ T3031] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
[   65.795967][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
[   65.803090][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
[   65.812250][ T5570] 8021q: adding VLAN 0 to HW filter on device batadv0
[   65.826943][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready
[   65.840970][ T5570] device veth0_vlan entered promiscuous mode
[   65.846214][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready
[   65.853729][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready
[   65.859777][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready
[   65.869781][ T5570] device veth1_vlan entered promiscuous mode
[   65.876428][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready
[   65.893202][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
[   65.901517][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
[   65.909785][ T5570] device veth0_macvtap entered promiscuous mode
[   65.919316][ T5570] device veth1_macvtap entered promiscuous mode
[   65.932694][ T5570] batman_adv: batadv0: Interface activated: batadv_slave_0
[   65.938869][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
[   65.947434][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
[   65.956647][ T5570] batman_adv: batadv0: Interface activated: batadv_slave_1
[   65.963867][ T3061] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
[   65.973107][ T5570] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[   65.981275][ T5570] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[   65.988383][ T5570] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[   65.996540][ T5570] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[   66.009412][ T3061] ================================================================================
[   66.017125][ T3061] UBSAN: signed-integer-overflow in ./arch/x86/include/asm/atomic.h:165:11
[   66.024329][ T3061] -163290563 + -2098288399 cannot be represented in type 'int'
[   66.031757][ T3061] CPU: 0 PID: 3061 Comm: kworker/u2:8 Not tainted syzkaller #0
[   66.038134][ T3061] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
[   66.048130][ T3061] Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
[   66.053893][ T3061] Call Trace:
[   66.057427][ T3061]  dump_stack+0xfd/0x16e
[   66.060951][ T3061]  ubsan_epilogue+0xa/0x30
[   66.064639][ T3061]  handle_overflow+0x192/0x1b0
[   66.068437][ T3061]  ? prandom_u32+0x217/0x260
[   66.072280][ T3061]  ip_idents_reserve+0x14a/0x170
[   66.076197][ T3061]  __ip_select_ident+0xe4/0x1c0
[   66.080020][ T3061]  iptunnel_xmit+0x468/0x850
[   66.083815][ T3061]  udp_tunnel_xmit_skb+0x1ba/0x290
[   66.088108][ T3061]  send4+0x5d4/0xaf0
[   66.091339][ T3061]  wg_socket_send_skb_to_peer+0xcd/0x1c0
[   66.095883][ T3061]  wg_packet_handshake_send_worker+0x16b/0x280
[   66.100935][ T3061]  process_one_work+0x85e/0xff0
[   66.104997][ T3061]  worker_thread+0xa9b/0x1430
[   66.108751][ T3061]  ? lock_release+0x69/0x640
[   66.112517][ T3061]  ? rcu_lock_release+0x20/0x20
[   66.116506][ T3061]  kthread+0x386/0x410
[   66.119891][ T3061]  ? rcu_lock_release+0x20/0x20
[   66.124100][ T3061]  ? kthread_blkcg+0xd0/0xd0
[   66.127889][ T3061]  ret_from_fork+0x1f/0x30
[   66.131580][ T3061] ================================================================================
[   66.138816][ T3061] Kernel panic - not syncing: UBSAN: panic_on_warn set ...
[   66.144565][ T3061] CPU: 0 PID: 3061 Comm: kworker/u2:8 Not tainted syzkaller #0
[   66.150499][ T3061] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
[   66.159482][ T3061] Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
[   66.165195][ T3061] Call Trace:
[   66.167897][ T3061]  dump_stack+0xfd/0x16e
[   66.171471][ T3061]  panic+0x2f0/0x9c0
[   66.174602][ T3061]  check_panic_on_warn+0x95/0xe0
[   66.178727][ T3061]  handle_overflow+0x192/0x1b0
[   66.182743][ T3061]  ? prandom_u32+0x217/0x260
[   66.186508][ T3061]  ip_idents_reserve+0x14a/0x170
[   66.190664][ T3061]  __ip_select_ident+0xe4/0x1c0
[   66.194678][ T3061]  iptunnel_xmit+0x468/0x850
[   66.198320][ T3061]  udp_tunnel_xmit_skb+0x1ba/0x290
[   66.202576][ T3061]  send4+0x5d4/0xaf0
[   66.205845][ T3061]  wg_socket_send_skb_to_peer+0xcd/0x1c0
[   66.210583][ T3061]  wg_packet_handshake_send_worker+0x16b/0x280
[   66.215775][ T3061]  process_one_work+0x85e/0xff0
[   66.219866][ T3061]  worker_thread+0xa9b/0x1430
[   66.223801][ T3061]  ? lock_release+0x69/0x640
[   66.227824][ T3061]  ? rcu_lock_release+0x20/0x20
[   66.231900][ T3061]  kthread+0x386/0x410
[   66.235406][ T3061]  ? rcu_lock_release+0x20/0x20
[   66.239449][ T3061]  ? kthread_blkcg+0xd0/0xd0
[   66.243419][ T3061]  ret_from_fork+0x1f/0x30
[   66.247485][ T3061] Kernel Offset: disabled
[   66.251127][ T3061] Rebooting in 86400 seconds..

VM DIAGNOSIS:
07:40:09  Registers:
info registers vcpu 0

CPU#0
RAX=0000000000000036 RBX=0000000000000036 RCX=0000000000000000 RDX=00000000000003f8
RSI=0000000000000000 RDI=0000000000000020 RBP=00000000000003f8 RSP=ffffc9000172f4e0
R8 =dffffc0000000000 R9 =fffff520002e5e9e R10=fffff520002e5e9e R11=ffffffff83f79850
R12=dffffc0000000000 R13=1ffffffff2ad2063 R14=ffffffff96179de0 R15=0000000000000000
RIP=ffffffff83f798c8 RFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 0000000000000000 ffffffff 00c00000
CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0000 0000000000000000 ffffffff 00c00000
FS =0000 0000000000000000 ffffffff 00c00000
GS =0000 ffff888020600000 ffffffff 00c00000
LDT=0000 0000000000000000 ffffffff 00c00000
TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy
GDT=     fffffe0000001000 0000007f
IDT=     fffffe0000000000 00000fff
CR0=80050033 CR2=00007f9d25c90e9c CR3=000000003f184000 CR4=00350ef0
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 
DR6=00000000fffe0ff0 DR7=0000000000000400
EFER=0000000000000d01
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
Opmask00=0000000040410888 Opmask01=0000000000000fff Opmask02=00000000ffffffef Opmask03=0000000000000000
Opmask04=0000000000000000 Opmask05=0000000000000000 Opmask06=0000000000000000 Opmask07=0000000000000000
ZMM00=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 b8a5606d93fbf234 4e6d6128c1c61247
ZMM01=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 e69291a55adf1a4d bc79a80ad3c0fce0
ZMM02=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 be6cebfbb543848d 5148acc6845117c5
ZMM03=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 4a118d849a30d684 02106ca1c36d1727
ZMM04=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 00000000ffffffff 00000000000000b4
ZMM05=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000034
ZMM06=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 f280979acd555a03 dd619a0e2b11f92c
ZMM07=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 4db1fdda4413481c 0000000000000000
ZMM08=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 9675387fceff6377 c2b3d307affe2114
ZMM09=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 d99f887700000000 25c03f609d700a96
ZMM10=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 15ad1dc2a12d429b 71118e54ff6cdf2d
ZMM11=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 fbb4f24384a52b52 900c1a64c85601c3
ZMM12=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM13=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM14=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 a54ff53a3c6ef372 bb67ae856a09e667
ZMM15=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 5be0cd191f83d9ab 9b05688c510e527f
ZMM16=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM17=0000000000000000 0000000000000000 0000000000000000 0000000000000000 2525252525252525 2525252525252525 2525252525252525 2525252525252525
ZMM18=0000000000000000 0000000000000000 0000000000000000 0000000000000000 00306e6170737265 0030657267367069 00306c6e74367069 00306974765f3670
ZMM19=0000000000000000 0000000000000000 0000000000000000 0000000000000000 6900306974765f70 6900306c6e757400 3074697300326777 0031677700306777
ZMM20=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM21=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM22=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM23=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM24=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM25=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM26=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM27=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM28=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM29=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM30=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
ZMM31=0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000


syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build317169965=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at d7384b6d0bf
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d7384b6d0bff77c60aad349866f126ab16ce5296 -X github.com/google/syzkaller/prog.gitRevisionDate=20250710-085248"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d7384b6d0bff77c60aad349866f126ab16ce5296\"
/usr/bin/ld: /tmp/ccf2gjJF.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking


Error text is too large and was truncated, full error text is at:
https://syzkaller.appspot.com/x/error.txt?x=17bd0be2580000


Tested on:

commit:         d3d0b4e2 Linux 5.10.245
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.10.y
kernel config:  https://syzkaller.appspot.com/x/.config?x=768d3f2193745e75
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16728258580000

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com
Tested-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com

Tested on:

commit:         8e6e2188 Linux 6.1.157
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15be9be2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1c4111dd2cd8811f
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=117c7734580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com
Tested-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com

Tested on:

commit:         4fc43deb Linux 6.12.55
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-6.12.y
console output: https://syzkaller.appspot.com/x/log.txt?x=147b0be2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=45603f6730eb4fd7
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=137a8c92580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to checkout kernel repo https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/linux-5.10.y: failed to run ["git" "fetch" "--force" "4d52a57a3858a6eee0d0b25cc3a0c9533f747d8f" "linux-5.10.y"]: exit status 128


Tested on:

commit:         [unknown 
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux-5.10.y
kernel config:  https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16863614580000

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to checkout kernel repo https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/linux-6.1.y: failed to run ["git" "fetch" "--force" "4d52a57a3858a6eee0d0b25cc3a0c9533f747d8f" "linux-6.1.y"]: exit status 128


Tested on:

commit:         [unknown 
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux-6.1.y
kernel config:  https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=16f157e2580000

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to checkout kernel repo https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/linux-6.12.y: failed to run ["git" "fetch" "--force" "4d52a57a3858a6eee0d0b25cc3a0c9533f747d8f" "linux-6.12.y"]: exit status 128


Tested on:

commit:         [unknown 
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux-6.12.y
kernel config:  https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       
patch:          https://syzkaller.appspot.com/x/patch.diff?x=126b832f980000

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

fs/ocfs2/ocfs2_fs.h:474:40: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:489:40: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:502:43: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:646:26: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:659:16: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:807:37: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:943:43: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:1030:39: error: expected ';' at end of declaration list


Tested on:

commit:         d3d0b4e2 Linux 5.10.245
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.10.y
kernel config:  https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1289dd42580000

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

fs/ocfs2/ocfs2_fs.h:472:40: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:487:40: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:500:43: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:644:26: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:657:16: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:805:37: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:941:43: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:1028:39: error: expected ';' at end of declaration list
fs/ocfs2/ocfs2_fs.h:472:40:fs/ocfs2/ocfs2_fs.h:644:26: error: expected ';' at end of declaration list
  472 | /*10*/  struct ocfs2_extent_rec lfs/ocfs2/ocfs2_fs.h:657:16: error: expected ';' at end of declaration list
 |         __u8    ifs/ocfs2/ocfs2_fs.hd_data[] __coun:t487:40: error: expected ';' at end of declaration list
      | :                         ^500:43: error: expected ';' at end of declaration list
  644 | /*10*/  fs/ocfs2/ocfs2_fs.h:1028:39: error: expected ';' at end of declaration list


Tested on:

commit:         8e6e2188 Linux 6.1.157
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-6.1.y
kernel config:  https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=135b57e2580000

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com
Tested-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com

Tested on:

commit:         4fc43deb Linux 6.12.55
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-6.12.y
console output: https://syzkaller.appspot.com/x/log.txt?x=11b2dfe2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=45603f6730eb4fd7
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11db57e2580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
UBSAN: signed-integer-overflow in ip_idents_reserve

================================================================================
UBSAN: signed-integer-overflow in ./arch/x86/include/asm/atomic.h:165:11
1231360813 + 2090395797 cannot be represented in type 'int'
CPU: 0 PID: 3029 Comm: kworker/u2:4 Not tainted syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
Call Trace:
 <IRQ>
 dump_stack+0xfd/0x16e lib/dump_stack.c:118
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:148
 handle_overflow+0x192/0x1b0 lib/ubsan.c:180
 arch_atomic_add_return arch/x86/include/asm/atomic.h:165 [inline]
 atomic_add_return include/asm-generic/atomic-instrumented.h:73 [inline]
 ip_idents_reserve+0x14a/0x170 net/ipv4/route.c:521
 __ip_select_ident+0xe4/0x1c0 net/ipv4/route.c:538
 ip_select_ident_segs include/net/ip.h:525 [inline]
 ip_select_ident include/net/ip.h:532 [inline]
 __ip_make_skb+0xf7b/0x19c0 net/ipv4/ip_output.c:1551
 ip_finish_skb include/net/ip.h:244 [inline]
 ip_push_pending_frames+0x2c/0x150 net/ipv4/ip_output.c:1606
 __icmp_send+0xc28/0xf70 net/ipv4/icmp.c:776
 icmp_send include/net/icmp.h:43 [inline]
 __udp4_lib_rcv+0x14f7/0x2080 net/ipv4/udp.c:2438
 ip_protocol_deliver_rcu+0x405/0x7e0 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x1d8/0x330 net/ipv4/ip_input.c:231
 NF_HOOK+0x25b/0x2d0 include/linux/netfilter.h:296
 NF_HOOK+0x25b/0x2d0 include/linux/netfilter.h:296
 __netif_receive_skb_one_core net/core/dev.c:5395 [inline]
 __netif_receive_skb+0x144/0x380 net/core/dev.c:5509
 process_backlog+0x4ef/0x6e0 net/core/dev.c:6416
 napi_poll net/core/dev.c:6867 [inline]
 net_rx_action+0x4b3/0xc30 net/core/dev.c:6937
 __do_softirq+0x267/0x92e kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x9b/0xe0 arch/x86/kernel/irq_64.c:77
 do_softirq+0xc4/0x100 kernel/softirq.c:343
 __local_bh_enable_ip+0x121/0x160 kernel/softirq.c:195
 wg_socket_send_skb_to_peer+0x167/0x1c0 drivers/net/wireguard/socket.c:184
 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline]
 wg_packet_handshake_send_worker+0x16b/0x280 drivers/net/wireguard/send.c:51
 process_one_work+0x85e/0xff0 kernel/workqueue.c:2282
 worker_thread+0xa9b/0x1430 kernel/workqueue.c:2428
 kthread+0x386/0x410 kernel/kthread.c:328
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
================================================================================


Tested on:

commit:         d3d0b4e2 Linux 5.10.245
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.10.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14df8fe2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=768d3f2193745e75
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1063dfe2580000

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com
Tested-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com

Tested on:

commit:         8e6e2188 Linux 6.1.157
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1482bd42580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1c4111dd2cd8811f
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14059f34580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_truncate_log_needs_flush (2)

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com
Tested-by: syzbot+c24237f0eee59c0c2abb@syzkaller.appspotmail.com

Tested on:

commit:         4fc43deb Linux 6.12.55
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-6.12.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14844bcd980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=45603f6730eb4fd7
dashboard link: https://syzkaller.appspot.com/bug?extid=c24237f0eee59c0c2abb
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12b7c32f980000

Note: testing is done by a robot and is best-effort only.