Re: [f2fs-dev] [syzbot] [f2fs?] kernel BUG in new_curseg (2)

[syzbot <syzbot+15669ec8c35ddf6c3d43@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    a64dcfb451e2 Linux 6.14-rc2
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17297b18580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7f246b548ed0635a
dashboard link: https://syzkaller.appspot.com/bug?extid=15669ec8c35ddf6c3d43
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=103943f8580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12da1bdf980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-a64dcfb4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6a816640d31b/vmlinux-a64dcfb4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b5cb42ffa4f6/bzImage-a64dcfb4.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/caba9b9b8f24/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=14da1bdf980000)
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/270c3c4c1558/mount_6.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=121672a4580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+15669ec8c35ddf6c3d43@syzkaller.appspotmail.com

F2FS-fs (loop0): Found nat_bits in checkpoint
F2FS-fs (loop0): Start checkpoint disabled!
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e6
------------[ cut here ]------------
kernel BUG at fs/f2fs/segment.c:2809!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5304 Comm: syz-executor274 Not tainted 6.14.0-rc2-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:get_new_segment fs/f2fs/segment.c:2809 [inline]
RIP: 0010:new_curseg+0x1f52/0x1f70 fs/f2fs/segment.c:2939
Code: fb fd e9 1a fa ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4c fa ff ff 48 89 df e8 59 4e fb fd e9 3f fa ff ff e8 5f b5 94 fd 90 <0f> 0b e8 57 b5 94 fd 90 0f 0b e8 4f b5 94 fd 90 0f 0b e8 47 b5 94
RSP: 0018:ffffc9000d0af4a8 EFLAGS: 00010293
RAX: ffffffff842a9a41 RBX: 0000000000000018 RCX: ffff88801ede4880
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000000000000018
RBP: dffffc0000000000 R08: ffffffff842a8875 R09: fffff52001a15e84
R10: dffffc0000000000 R11: fffff52001a15e84 R12: 0000000000000018
R13: ffff888043de5101 R14: 0000000000000018 R15: ffff888038298f58
FS:  000055556f014380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000042a82000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __allocate_new_segment+0x1ce/0x940 fs/f2fs/segment.c:3273
 f2fs_allocate_new_section fs/f2fs/segment.c:3287 [inline]
 f2fs_allocate_pinning_section+0xfa/0x4e0 fs/f2fs/segment.c:3301
 f2fs_expand_inode_data+0x696/0xca0 fs/f2fs/file.c:1849
 f2fs_fallocate+0x537/0xa10 fs/f2fs/file.c:1959
 vfs_fallocate+0x623/0x7a0 fs/open.c:338
 do_vfs_ioctl+0x258c/0x2e40 fs/ioctl.c:885
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffbafdefd99
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffecbc98b98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000400000000080 RCX: 00007ffbafdefd99
RDX: 00004000000000c0 RSI: 0000000040305828 RDI: 0000000000000005
RBP: 0030656c69662f2e R08: 000055556f0154c0 R09: 000055556f0154c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00004000000000c0
R13: 00004000000000e0 R14: 00004000000000c2 R15: 00007ffbafe3903b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:get_new_segment fs/f2fs/segment.c:2809 [inline]
RIP: 0010:new_curseg+0x1f52/0x1f70 fs/f2fs/segment.c:2939
Code: fb fd e9 1a fa ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4c fa ff ff 48 89 df e8 59 4e fb fd e9 3f fa ff ff e8 5f b5 94 fd 90 <0f> 0b e8 57 b5 94 fd 90 0f 0b e8 4f b5 94 fd 90 0f 0b e8 47 b5 94
RSP: 0018:ffffc9000d0af4a8 EFLAGS: 00010293
RAX: ffffffff842a9a41 RBX: 0000000000000018 RCX: ffff88801ede4880
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000000000000018
RBP: dffffc0000000000 R08: ffffffff842a8875 R09: fffff52001a15e84
R10: dffffc0000000000 R11: fffff52001a15e84 R12: 0000000000000018
R13: ffff888043de5101 R14: 0000000000000018 R15: ffff888038298f58
FS:  000055556f014380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000042a82000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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.


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