Hello,
syzbot found the following issue on:
HEAD commit: bf1e3b1cb1e0 Linux 6.1.85
git tree: linux-6.1.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=17c032db180000
kernel config:
https://syzkaller.appspot.com/x/.config?x=d3e21b90946dbbab
dashboard link:
https://syzkaller.appspot.com/bug?extid=351f700c0b4cbf13a0b2
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/75265c862e54/disk-bf1e3b1c.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/1d22ca40ea90/vmlinux-bf1e3b1c.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/a5fcb5ebd870/bzImage-bf1e3b1c.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+351f70...@syzkaller.appspotmail.com
======================================================
WARNING: possible circular locking dependency detected
6.1.85-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/8302 is trying to acquire lock:
ffff8880b9935e90 (lock#10){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff8880b9935e90 (lock#10){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x84/0x670 mm/mmap_lock.c:237
but task is already holding lock:
ffff8880b993a258 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x58c/0xf90
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&pool->lock){-.-.}-{2:2}:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
__queue_work+0x58c/0xf90
queue_work_on+0x14b/0x250 kernel/workqueue.c:1548
queue_work include/linux/workqueue.h:512 [inline]
schedule_work include/linux/workqueue.h:573 [inline]
aio_poll_wake+0x1a2/0x9a0 fs/aio.c:1821
__wake_up_common+0x2a0/0x4e0 kernel/sched/wait.c:107
__wake_up_common_lock kernel/sched/wait.c:138 [inline]
__wake_up+0x11a/0x1c0 kernel/sched/wait.c:160
do_signalfd4+0x2e6/0x350 fs/signalfd.c:295
__do_sys_signalfd4 fs/signalfd.c:311 [inline]
__se_sys_signalfd4 fs/signalfd.c:302 [inline]
__x64_sys_signalfd4+0x170/0x1b0 fs/signalfd.c:302
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #2 (&sighand->signalfd_wqh){-.-.}-{2:2}:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
__wake_up_common_lock kernel/sched/wait.c:137 [inline]
__wake_up+0xfd/0x1c0 kernel/sched/wait.c:160
signalfd_notify include/linux/signalfd.h:22 [inline]
__send_signal_locked+0xbdc/0xdc0 kernel/signal.c:1177
do_notify_parent+0xe2b/0x1100 kernel/signal.c:2120
exit_notify kernel/exit.c:744 [inline]
do_exit+0x172e/0x26a0 kernel/exit.c:889
do_group_exit+0x202/0x2b0 kernel/exit.c:1019
__do_sys_exit_group kernel/exit.c:1030 [inline]
__se_sys_exit_group kernel/exit.c:1028 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1028
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #1 (&sighand->siglock){-.-.}-{2:2}:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
__lock_task_sighand+0x145/0x2d0 kernel/signal.c:1410
lock_task_sighand include/linux/sched/signal.h:745 [inline]
do_send_sig_info kernel/signal.c:1299 [inline]
group_send_sig_info+0x26c/0x300 kernel/signal.c:1448
bpf_send_signal_common+0x2d8/0x420 kernel/trace/bpf_trace.c:882
____bpf_send_signal_thread kernel/trace/bpf_trace.c:899 [inline]
bpf_send_signal_thread+0x12/0x20 kernel/trace/bpf_trace.c:897
0xffffffffa0000962
bpf_dispatcher_nop_func include/linux/bpf.h:989 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2273 [inline]
bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2314
trace_mmap_lock_acquire_returned include/trace/events/mmap_lock.h:52 [inline]
__mmap_lock_do_trace_acquire_returned+0x5e3/0x670 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_write_lock_killable include/linux/mmap_lock.h:88 [inline]
__do_sys_mremap mm/mremap.c:943 [inline]
__se_sys_mremap+0x1998/0x1b20 mm/mremap.c:889
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #0 (lock#10){+.+.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
__mmap_lock_do_trace_acquire_returned+0x9d/0x670 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:137 [inline]
stack_map_get_build_id_offset+0x99e/0x9c0 kernel/bpf/stackmap.c:144
__bpf_get_stack+0x495/0x570 kernel/bpf/stackmap.c:452
____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1877 [inline]
bpf_get_stack_raw_tp+0x1b2/0x220 kernel/trace/bpf_trace.c:1867
bpf_prog_e6cf5f9c69743609+0x3a/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:989 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2273 [inline]
bpf_trace_run3+0x231/0x440 kernel/trace/bpf_trace.c:2313
trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline]
__queue_work+0xeeb/0xf90 kernel/workqueue.c:1500
queue_work_on+0x14b/0x250 kernel/workqueue.c:1548
bpf_prog_load+0xda2/0x1bb0 kernel/bpf/syscall.c:2679
__sys_bpf+0x382/0x6c0 kernel/bpf/syscall.c:5005
__do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5107
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
other info that might help us debug this:
Chain exists of:
lock#10 --> &sighand->signalfd_wqh --> &pool->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&pool->lock);
lock(&sighand->signalfd_wqh);
lock(&pool->lock);
lock(lock#10);
*** DEADLOCK ***
4 locks held by syz-executor.0/8302:
#0: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xe5/0xf90 kernel/workqueue.c:1443
#1: ffff8880b993a258 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x58c/0xf90
#2: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#2: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#2: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2272 [inline]
#2: ffffffff8d12ac40 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run3+0x146/0x440 kernel/trace/bpf_trace.c:2313
#3: ffff888029a1f1d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#3: ffff888029a1f1d8 (&mm->mmap_lock){++++}-{3:3}, at: stack_map_get_build_id_offset+0x232/0x9c0 kernel/bpf/stackmap.c:144
stack backtrace:
CPU: 1 PID: 8302 Comm: syz-executor.0 Not tainted 6.1.85-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
__lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
__mmap_lock_do_trace_acquire_returned+0x9d/0x670 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:137 [inline]
stack_map_get_build_id_offset+0x99e/0x9c0 kernel/bpf/stackmap.c:144
__bpf_get_stack+0x495/0x570 kernel/bpf/stackmap.c:452
____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1877 [inline]
bpf_get_stack_raw_tp+0x1b2/0x220 kernel/trace/bpf_trace.c:1867
bpf_prog_e6cf5f9c69743609+0x3a/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:989 [inline]
__bpf_prog_run include/linux/filter.h:603 [inline]
bpf_prog_run include/linux/filter.h:610 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:2273 [inline]
bpf_trace_run3+0x231/0x440 kernel/trace/bpf_trace.c:2313
trace_workqueue_queue_work include/trace/events/workqueue.h:23 [inline]
__queue_work+0xeeb/0xf90 kernel/workqueue.c:1500
queue_work_on+0x14b/0x250 kernel/workqueue.c:1548
bpf_prog_load+0xda2/0x1bb0 kernel/bpf/syscall.c:2679
__sys_bpf+0x382/0x6c0 kernel/bpf/syscall.c:5005
__do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5107
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6b3347de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6b342c90c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f6b335abf80 RCX: 00007f6b3347de69
RDX: 0000000000000090 RSI: 00000000200000c0 RDI: 0000000000000005
RBP: 00007f6b334ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6b335abf80 R15: 00007ffda166c1a8
</TASK>
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): filesystem is read-only
EXT4-fs (loop0): ext4_check_descriptors: Block bitmap for group 0 overlaps block group descriptors
EXT4-fs (loop0): filesystem is read-only
EXT4-fs (loop0): orphan cleanup on readonly fs
EXT4-fs error (device loop0): ext4_validate_block_bitmap:438: comm syz-executor.0: bg 0: block 64: padding at end of block bitmap is not set
EXT4-fs error (device loop0) in ext4_mb_clear_bb:6168: Corrupt filesystem
EXT4-fs (loop0): 1 orphan inode deleted
EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none.
---
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