FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
5.15.163-syzkaller #0 Not tainted
------------------------------------------------------
syz.2.562/6459 is trying to acquire lock:
ffffffff8c7fc378 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138
but task is already holding lock:
ffff8880b9a3a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
_raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:368
raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
raw_spin_rq_lock kernel/sched/sched.h:1326 [inline]
rq_lock kernel/sched/sched.h:1621 [inline]
task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11495
sched_cgroup_fork+0x2d3/0x330 kernel/sched/core.c:4466
copy_process+0x224a/0x3ef0 kernel/fork.c:2320
kernel_clone+0x210/0x960 kernel/fork.c:2604
kernel_thread+0x168/0x1e0 kernel/fork.c:2656
rest_init+0x21/0x330 init/main.c:706
start_kernel+0x48c/0x540 init/main.c:1140
secondary_startup_64_no_verify+0xb1/0xbb
-> #1 (&p->pi_lock){-.-.}-{2:2}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
try_to_wake_up+0xae/0x1300 kernel/sched/core.c:4030
up+0x6e/0x90 kernel/locking/semaphore.c:190
__up_console_sem+0x11a/0x1e0 kernel/printk/printk.c:256
console_unlock+0x1145/0x12b0 kernel/printk/printk.c:2760
vprintk_emit+0xbf/0x150 kernel/printk/printk.c:2274
_printk+0xd1/0x120 kernel/printk/printk.c:2299
__ext4_error_inode+0x4c4/0x4e0 fs/ext4/super.c:778
ext4_check_blockref+0x254/0x2a0 fs/ext4/block_validity.c:364
__ext4_iget+0x28bb/0x3f00 fs/ext4/inode.c:4861
ext4_orphan_get+0x1d4/0x5f0 fs/ext4/ialloc.c:1397
ext4_orphan_cleanup+0x88b/0x1240 fs/ext4/orphan.c:467
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4974
mount_bdev+0x2c9/0x3f0 fs/super.c:1387
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1517
do_new_mount+0x2ba/0xb40 fs/namespace.c:3005
do_mount fs/namespace.c:3348 [inline]
__do_sys_mount fs/namespace.c:3556 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #0 ((console_sem).lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138
__down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:239
console_trylock kernel/printk/printk.c:2575 [inline]
console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867
vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273
_printk+0xd1/0x120 kernel/printk/printk.c:2299
fail_dump lib/fault-inject.c:45 [inline]
should_fail+0x36c/0x4c0 lib/fault-inject.c:146
strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:300 [inline]
bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296
bpf_prog_e42f6260c1b72fb3+0x35/0x934
bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline]
bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1918
__traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220
trace_sched_switch include/trace/events/sched.h:220 [inline]
__schedule+0x1e8d/0x45b0 kernel/sched/core.c:6373
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780
irqentry_exit+0x53/0x80 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643
bytes_is_nonzero mm/kasan/generic.c:85 [inline]
memory_is_nonzero mm/kasan/generic.c:102 [inline]
memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
memory_is_poisoned mm/kasan/generic.c:159 [inline]
check_region_inline mm/kasan/generic.c:180 [inline]
kasan_check_range+0x81/0x290 mm/kasan/generic.c:189
memset+0x1f/0x40 mm/kasan/shadow.c:44
__copy_msghdr_from_user+0x9f/0x7c0 net/socket.c:2310
copy_msghdr_from_user net/socket.c:2364 [inline]
sendmsg_copy_msghdr net/socket.c:2462 [inline]
___sys_sendmsg+0x166/0x2e0 net/socket.c:2481
__sys_sendmmsg+0x2bf/0x560 net/socket.c:2571
__do_sys_sendmmsg net/socket.c:2600 [inline]
__se_sys_sendmmsg net/socket.c:2597 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2597
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
other info that might help us debug this:
Chain exists of:
(console_sem).lock --> &p->pi_lock --> &rq->__lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&rq->__lock);
lock(&p->pi_lock);
lock(&rq->__lock);
lock((console_sem).lock);
*** DEADLOCK ***
2 locks held by syz.2.562/6459:
#0: ffff8880b9a3a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
#1: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
stack backtrace:
CPU: 0 PID: 6459 Comm: syz.2.562 Not tainted 5.15.163-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:138
__down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:239
console_trylock kernel/printk/printk.c:2575 [inline]
console_trylock_spinning+0x8a/0x3f0 kernel/printk/printk.c:1867
vprintk_emit+0xa6/0x150 kernel/printk/printk.c:2273
_printk+0xd1/0x120 kernel/printk/printk.c:2299
fail_dump lib/fault-inject.c:45 [inline]
should_fail+0x36c/0x4c0 lib/fault-inject.c:146
strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:300 [inline]
bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296
bpf_prog_e42f6260c1b72fb3+0x35/0x934
bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline]
bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1918
__traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220
trace_sched_switch include/trace/events/sched.h:220 [inline]
__schedule+0x1e8d/0x45b0 kernel/sched/core.c:6373
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780
irqentry_exit+0x53/0x80 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x81/0x290 mm/kasan/generic.c:189
Code: df 4f 8d 34 1a 4c 89 f5 4c 29 cd 48 83 fd 10 7f 26 48 85 ed 0f 84 3a 01 00 00 49 f7 d2 49 01 da 41 80 39 00 0f 85 c4 01 00 00 <49> ff c1 49 ff c2 75 ee e9 1d 01 00 00 45 89 cf 41 83 e7 07 0f 84
RSP: 0018:ffffc900038c78d8 EFLAGS: 00000246
RAX: ffffffff882ce801 RBX: 1ffff92000718f30 RCX: ffffffff882ce8df
RDX: 0000000000000001 RSI: 0000000000000038 RDI: ffffc900038c7980
RBP: 0000000000000007 R08: dffffc0000000000 R09: fffff52000718f36
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000000000000
R13: ffffc900038c7d40 R14: fffff52000718f37 R15: dffffc0000000000
memset+0x1f/0x40 mm/kasan/shadow.c:44
__copy_msghdr_from_user+0x9f/0x7c0 net/socket.c:2310
copy_msghdr_from_user net/socket.c:2364 [inline]
sendmsg_copy_msghdr net/socket.c:2462 [inline]
___sys_sendmsg+0x166/0x2e0 net/socket.c:2481
__sys_sendmmsg+0x2bf/0x560 net/socket.c:2571
__do_sys_sendmmsg net/socket.c:2600 [inline]
__se_sys_sendmmsg net/socket.c:2597 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2597
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8492612b59
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:00007f8491051048 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f84927a3110 RCX: 00007f8492612b59
RDX: 0000000000000001 RSI: 0000000020000f00 RDI: 0000000000000005
RBP: 00007f84910510a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000024044cc1 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000006e R14: 00007f84927a3110 R15: 00007ffe0acf5be8
CPU: 0 PID: 6459 Comm: syz.2.562 Not tainted 5.15.163-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
fail_dump lib/fault-inject.c:52 [inline]
should_fail+0x38a/0x4c0 lib/fault-inject.c:146
strncpy_from_user+0x32/0x370 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:295
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:194 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:300 [inline]
bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:296
bpf_prog_e42f6260c1b72fb3+0x35/0x934
bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:1880 [inline]
bpf_trace_run3+0x1d1/0x380 kernel/trace/bpf_trace.c:1918
__traceiter_sched_switch+0x7d/0xb0 include/trace/events/sched.h:220
trace_sched_switch include/trace/events/sched.h:220 [inline]
__schedule+0x1e8d/0x45b0 kernel/sched/core.c:6373
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6780
irqentry_exit+0x53/0x80 kernel/entry/common.c:432
asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:643
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x81/0x290 mm/kasan/generic.c:189
Code: df 4f 8d 34 1a 4c 89 f5 4c 29 cd 48 83 fd 10 7f 26 48 85 ed 0f 84 3a 01 00 00 49 f7 d2 49 01 da 41 80 39 00 0f 85 c4 01 00 00 <49> ff c1 49 ff c2 75 ee e9 1d 01 00 00 45 89 cf 41 83 e7 07 0f 84
RSP: 0018:ffffc900038c78d8 EFLAGS: 00000246
RAX: ffffffff882ce801 RBX: 1ffff92000718f30 RCX: ffffffff882ce8df
RDX: 0000000000000001 RSI: 0000000000000038 RDI: ffffc900038c7980
RBP: 0000000000000007 R08: dffffc0000000000 R09: fffff52000718f36
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000000000000
R13: ffffc900038c7d40 R14: fffff52000718f37 R15: dffffc0000000000
memset+0x1f/0x40 mm/kasan/shadow.c:44
__copy_msghdr_from_user+0x9f/0x7c0 net/socket.c:2310
copy_msghdr_from_user net/socket.c:2364 [inline]
sendmsg_copy_msghdr net/socket.c:2462 [inline]
___sys_sendmsg+0x166/0x2e0 net/socket.c:2481
__sys_sendmmsg+0x2bf/0x560 net/socket.c:2571
__do_sys_sendmmsg net/socket.c:2600 [inline]
__se_sys_sendmmsg net/socket.c:2597 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2597
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8492612b59
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:00007f8491051048 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f84927a3110 RCX: 00007f8492612b59
RDX: 0000000000000001 RSI: 0000000020000f00 RDI: 0000000000000005
RBP: 00007f84910510a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000024044cc1 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000006e R14: 00007f84927a3110 R15: 00007ffe0acf5be8
----------------
Code disassembly (best guess):
0: df 4f 8d fisttps -0x73(%rdi)
3: 34 1a xor $0x1a,%al
5: 4c 89 f5 mov %r14,%rbp
8: 4c 29 cd sub %r9,%rbp
b: 48 83 fd 10 cmp $0x10,%rbp
f: 7f 26 jg 0x37
11: 48 85 ed test %rbp,%rbp
14: 0f 84 3a 01 00 00 je 0x154
1a: 49 f7 d2 not %r10
1d: 49 01 da add %rbx,%r10
20: 41 80 39 00 cmpb $0x0,(%r9)
24: 0f 85 c4 01 00 00 jne 0x1ee
* 2a: 49 ff c1 inc %r9 <-- trapping instruction
2d: 49 ff c2 inc %r10
30: 75 ee jne 0x20
32: e9 1d 01 00 00 jmp 0x154
37: 45 89 cf mov %r9d,%r15d
3a: 41 83 e7 07 and $0x7,%r15d
3e: 0f .byte 0xf
3f: 84 .byte 0x84