* [syzbot] [net?] [bpf?] WARNING: ODEBUG bug in handle_softirqs
@ 2025-08-27 17:00 syzbot
2025-11-12 4:52 ` [syzbot] [hams?] " syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2025-08-27 17:00 UTC (permalink / raw)
To: andrii, ast, bpf, daniel, linux-kernel, netdev, peterz,
syzkaller-bugs, tglx
Hello,
syzbot found the following issue on:
HEAD commit: 4774cfe3543a Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=140f4e82580000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a936e3316f9e2dc
dashboard link: https://syzkaller.appspot.com/bug?extid=60db000b8468baeddbb1
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/202021f78569/disk-4774cfe3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/694d0f540b2c/vmlinux-4774cfe3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c3c1a8d42953/bzImage-4774cfe3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+60db000b8468baeddbb1@syzkaller.appspotmail.com
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888055e82a78 object type: timer_list hint: br_ip6_multicast_port_query_expired+0x0/0x20 net/bridge/br_multicast.c:1682
WARNING: CPU: 0 PID: 15 at lib/debugobjects.c:615 debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Modules linked in:
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.16.0-rc1-syzkaller-00203-g4774cfe3543a #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Code: 4c 89 ff e8 17 37 5c fd 4d 8b 0f 48 c7 c7 a0 90 e2 8b 48 8b 34 24 4c 89 ea 89 e9 4d 89 f0 41 54 e8 4a 6a bc fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 77 9d d9 0a 48 83 c4 08 5b 41 5c 41 5d 41 5e 41
RSP: 0000:ffffc90000147758 EFLAGS: 00010282
RAX: bfb6a7e7ba7ad600 RBX: dffffc0000000000 RCX: ffff88801cef3c00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa9e4 R12: ffffffff8a423ca0
R13: ffffffff8be29220 R14: ffff888055e82a78 R15: ffffffff8b8ce020
FS: 0000000000000000(0000) GS:ffff888125c52000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8371b71d60 CR3: 000000005b468000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
debug_check_no_obj_freed+0x3a2/0x470 lib/debugobjects.c:1129
slab_free_hook mm/slub.c:2312 [inline]
slab_free mm/slub.c:4643 [inline]
kfree+0x112/0x440 mm/slub.c:4842
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x22b/0x480 lib/kobject.c:737
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2832
handle_softirqs+0x286/0x870 kernel/softirq.c:579
run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968
smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:164
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
---
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 to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [hams?] WARNING: ODEBUG bug in handle_softirqs
2025-08-27 17:00 [syzbot] [net?] [bpf?] WARNING: ODEBUG bug in handle_softirqs syzbot
@ 2025-11-12 4:52 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2025-11-12 4:52 UTC (permalink / raw)
To: andrii, ast, bpf, daniel, davem, edumazet, horms, kuba,
linux-hams, linux-kernel, netdev, pabeni, peterz, syzkaller-bugs,
tglx
syzbot has found a reproducer for the following issue on:
HEAD commit: 2666975a8905 Add linux-next specific files for 20251111
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13748212580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e82ba9dc816af74c
dashboard link: https://syzkaller.appspot.com/bug?extid=60db000b8468baeddbb1
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10646b42580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=133eec12580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/26ac789d9bdd/disk-2666975a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fabfe7978a23/vmlinux-2666975a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/82f010d50b37/bzImage-2666975a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+60db000b8468baeddbb1@syzkaller.appspotmail.com
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888028ee8090 object type: timer_list hint: rose_t0timer_expiry+0x0/0x350 net/rose/rose_link.c:-1
WARNING: lib/debugobjects.c:615 at debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612, CPU#1: syz.2.1147/9544
Modules linked in:
CPU: 1 UID: 0 PID: 9544 Comm: syz.2.1147 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:debug_print_object+0x16b/0x1e0 lib/debugobjects.c:612
Code: 4c 89 ff e8 d7 19 86 fd 4d 8b 0f 48 c7 c7 80 1b e1 8b 48 8b 34 24 4c 89 ea 89 e9 4d 89 f0 41 54 e8 0a 38 e2 fc 48 83 c4 08 90 <0f> 0b 90 90 ff 05 47 22 1e 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc90000a08a00 EFLAGS: 00010296
RAX: cfc2b002eab41900 RBX: dffffc0000000000 RCX: ffff888031311e80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1c3a744 R12: ffffffff8a5327d0
R13: ffffffff8be11d00 R14: ffff888028ee8090 R15: ffffffff8b8cf8e0
FS: 00007fda22dbb6c0(0000) GS:ffff888125b82000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000d000 CR3: 0000000078a42000 CR4: 00000000003526f0
Call Trace:
<IRQ>
__debug_check_no_obj_freed lib/debugobjects.c:1099 [inline]
debug_check_no_obj_freed+0x3a2/0x470 lib/debugobjects.c:1129
slab_free_hook mm/slub.c:2470 [inline]
slab_free mm/slub.c:6661 [inline]
kfree+0x10c/0x6e0 mm/slub.c:6869
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183
call_timer_fn+0x16e/0x600 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x27d/0x880 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:727
irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1055 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1055
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2ac/0x3d0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 64 98 1b 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc90004e8f918 EFLAGS: 00000206
RAX: cfc2b002eab41900 RBX: 0000000000000283 RCX: cfc2b002eab41900
RDX: 0000000000000000 RSI: ffffffff8dc71e5c RDI: ffffffff8be111e0
RBP: ffff8880313129b0 R08: 0000000000000000 R09: ffffffff820eec00
R10: dffffc0000000000 R11: fffffbfff1f7eeef R12: 0000000000000000
R13: 0000000000000000 R14: ffff888034a18ca0 R15: ffff888031311e80
_inline_copy_from_user include/linux/uaccess.h:169 [inline]
_copy_from_user+0x28/0xb0 lib/usercopy.c:18
copy_from_user include/linux/uaccess.h:219 [inline]
snd_rawmidi_kernel_write1+0x3ab/0x650 sound/core/rawmidi.c:1560
snd_rawmidi_write+0x5a8/0xbc0 sound/core/rawmidi.c:1629
do_loop_readv_writev fs/read_write.c:850 [inline]
vfs_writev+0x4b6/0x960 fs/read_write.c:1059
do_writev+0x14d/0x2d0 fs/read_write.c:1103
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fda21f8f6c9
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:00007fda22dbb038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fda221e5fa0 RCX: 00007fda21f8f6c9
RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000004
RBP: 00007fda22011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda221e6038 R14: 00007fda221e5fa0 R15: 00007ffd404da6b8
</TASK>
----------------
Code disassembly (best guess):
0: 51 push %rcx
1: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
8: 00 00
a: 9c pushf
b: 8f 44 24 20 pop 0x20(%rsp)
f: f7 44 24 20 00 02 00 testl $0x200,0x20(%rsp)
16: 00
17: 75 56 jne 0x6f
19: f7 c3 00 02 00 00 test $0x200,%ebx
1f: 74 01 je 0x22
21: fb sti
22: 65 48 8b 05 64 98 1b mov %gs:0x111b9864(%rip),%rax # 0x111b988e
29: 11
* 2a: 48 3b 44 24 28 cmp 0x28(%rsp),%rax <-- trapping instruction
2f: 0f 85 8b 00 00 00 jne 0xc0
35: 48 83 c4 30 add $0x30,%rsp
39: 5b pop %rbx
3a: 41 5c pop %r12
3c: 41 5d pop %r13
3e: 41 5e pop %r14
---
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2025-11-12 4:52 UTC | newest]
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2025-08-27 17:00 [syzbot] [net?] [bpf?] WARNING: ODEBUG bug in handle_softirqs syzbot
2025-11-12 4:52 ` [syzbot] [hams?] " syzbot
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