------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc7-next-20220929 #1 Not tainted
------------------------------------------------------
syz-executor.1/3904 is trying to acquire lock:
ffffffff853faab8 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70
but task is already holding lock:
ffff88800e7f7020 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&ctx->lock){....}-{2:2}:
_raw_spin_lock+0x2a/0x40
__perf_event_task_sched_out+0x53b/0x18d0
__schedule+0xedd/0x2470
schedule+0xda/0x1b0
exit_to_user_mode_prepare+0x114/0x1a0
syscall_exit_to_user_mode+0x19/0x40
do_syscall_64+0x48/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #2 (&rq->__lock){-.-.}-{2:2}:
_raw_spin_lock_nested+0x30/0x40
raw_spin_rq_lock_nested+0x1e/0x30
task_fork_fair+0x63/0x4d0
sched_cgroup_fork+0x3d0/0x540
copy_process+0x4183/0x6e20
kernel_clone+0xe7/0x890
user_mode_thread+0xad/0xf0
rest_init+0x24/0x250
arch_call_rest_init+0xf/0x14
start_kernel+0x4c6/0x4eb
secondary_startup_64_no_verify+0xe0/0xeb
-> #1 (&p->pi_lock){-.-.}-{2:2}:
_raw_spin_lock_irqsave+0x39/0x60
try_to_wake_up+0xab/0x1930
up+0x75/0xb0
__up_console_sem+0x6e/0x80
console_unlock+0x46a/0x590
do_con_write+0xc05/0x1d50
con_write+0x21/0x40
n_tty_write+0x4d4/0xfe0
file_tty_write.constprop.0+0x455/0x8a0
vfs_write+0x9c3/0xd90
ksys_write+0x127/0x250
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 ((console_sem).lock){....}-{2:2}:
__lock_acquire+0x2a02/0x5e70
lock_acquire+0x1a2/0x530
_raw_spin_lock_irqsave+0x39/0x60
down_trylock+0xe/0x70
__down_trylock_console_sem+0x3b/0xd0
vprintk_emit+0x16b/0x560
vprintk+0x84/0xa0
_printk+0xba/0xf1
report_bug.cold+0x72/0xab
handle_bug+0x3c/0x70
exc_invalid_op+0x14/0x50
asm_exc_invalid_op+0x16/0x20
group_sched_out.part.0+0x2c7/0x460
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__schedule+0xedd/0x2470
schedule+0xda/0x1b0
exit_to_user_mode_prepare+0x114/0x1a0
syscall_exit_to_user_mode+0x19/0x40
do_syscall_64+0x48/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
other info that might help us debug this:
Chain exists of:
(console_sem).lock --> &rq->__lock --> &ctx->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ctx->lock);
lock(&rq->__lock);
lock(&ctx->lock);
lock((console_sem).lock);
*** DEADLOCK ***
2 locks held by syz-executor.1/3904:
#0: ffff88806cf37e98 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470
#1: ffff88800e7f7020 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0
stack backtrace:
CPU: 1 PID: 3904 Comm: syz-executor.1 Not tainted 6.0.0-rc7-next-20220929 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
dump_stack_lvl+0x8b/0xb3
check_noncircular+0x263/0x2e0
__lock_acquire+0x2a02/0x5e70
lock_acquire+0x1a2/0x530
_raw_spin_lock_irqsave+0x39/0x60
down_trylock+0xe/0x70
__down_trylock_console_sem+0x3b/0xd0
vprintk_emit+0x16b/0x560
vprintk+0x84/0xa0
_printk+0xba/0xf1
report_bug.cold+0x72/0xab
handle_bug+0x3c/0x70
exc_invalid_op+0x14/0x50
asm_exc_invalid_op+0x16/0x20
RIP: 0010:group_sched_out.part.0+0x2c7/0x460
Code: 5e 41 5f e9 8b ae ef ff e8 86 ae ef ff 65 8b 1d 6b 17 ac 7e 31 ff 89 de e8 26 ab ef ff 85 db 0f 84 8a 00 00 00 e8 69 ae ef ff <0f> 0b e9 a5 fe ff ff e8 5d ae ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff88803dbffc48 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88803dbb8000 RSI: ffffffff81565e67 RDI: 0000000000000005
RBP: ffff88803dc28000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865b405b R12: ffff88800e7f7000
R13: ffff88806cf3d2c0 R14: ffffffff8547d040 R15: 0000000000000002
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__schedule+0xedd/0x2470
schedule+0xda/0x1b0
exit_to_user_mode_prepare+0x114/0x1a0
syscall_exit_to_user_mode+0x19/0x40
do_syscall_64+0x48/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8f5a0ddb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8f57653218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f8f5a1f0f68 RCX: 00007f8f5a0ddb19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f8f5a1f0f6c
RBP: 00007f8f5a1f0f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007f8f5a1f0f6c
R13: 00007ffd8d6df8cf R14: 00007f8f57653300 R15: 0000000000022000
WARNING: CPU: 1 PID: 3904 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460
Modules linked in:
CPU: 1 PID: 3904 Comm: syz-executor.1 Not tainted 6.0.0-rc7-next-20220929 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:group_sched_out.part.0+0x2c7/0x460
Code: 5e 41 5f e9 8b ae ef ff e8 86 ae ef ff 65 8b 1d 6b 17 ac 7e 31 ff 89 de e8 26 ab ef ff 85 db 0f 84 8a 00 00 00 e8 69 ae ef ff <0f> 0b e9 a5 fe ff ff e8 5d ae ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff88803dbffc48 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88803dbb8000 RSI: ffffffff81565e67 RDI: 0000000000000005
RBP: ffff88803dc28000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865b405b R12: ffff88800e7f7000
R13: ffff88806cf3d2c0 R14: ffffffff8547d040 R15: 0000000000000002
FS: 00007f8f57653700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc09f407368 CR3: 000000001c24c000 CR4: 0000000000350ee0
Call Trace:
ctx_sched_out+0x8f1/0xc10
__perf_event_task_sched_out+0x6d0/0x18d0
__schedule+0xedd/0x2470
schedule+0xda/0x1b0
exit_to_user_mode_prepare+0x114/0x1a0
syscall_exit_to_user_mode+0x19/0x40
do_syscall_64+0x48/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8f5a0ddb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8f57653218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f8f5a1f0f68 RCX: 00007f8f5a0ddb19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f8f5a1f0f6c
RBP: 00007f8f5a1f0f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007f8f5a1f0f6c
R13: 00007ffd8d6df8cf R14: 00007f8f57653300 R15: 0000000000022000
irq event stamp: 1530
hardirqs last enabled at (1529): [] exit_to_user_mode_prepare+0x109/0x1a0
hardirqs last disabled at (1530): [] __schedule+0x1225/0x2470
softirqs last enabled at (1352): [] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (1291): [] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
hrtimer: interrupt took 16440 ns
Process accounting resumed
Process accounting resumed
audit: type=1400 audit(1664503395.624:9): avc: denied { associate } for pid=3933 comm="syz-executor.2" name="/" dev="devpts" ino=1 scontext=system_u:object_r:shell_exec_t:s0 tcontext=system_u:object_r:devpts_t:s0 tclass=filesystem permissive=1
FAT-fs (loop5): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop5): Unrecognized mount option "01777777777777777777777" or missing value
Process accounting resumed
FAT-fs (loop5): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop3): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop4): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop5): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop4): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop0): Unrecognized mount option "01777777777777777777777" or missing value
Process accounting resumed
FAT-fs (loop3): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop5): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop4): Unrecognized mount option "01777777777777777777777" or missing value
Process accounting resumed
FAT-fs (loop6): Unrecognized mount option "01777777777777777777777" or missing value
Process accounting resumed
Process accounting resumed
Process accounting resumed
FAT-fs (loop0): Unrecognized mount option "01777777777777777777777" or missing value
FAT-fs (loop6): Unrecognized mount option "01777777777777777777777" or missing value
Process accounting resumed
FAT-fs (loop3): Unrecognized mount option "01777777777777777777777" or missing value
Process accounting resumed
Process accounting resumed
Process accounting resumed
FAT-fs (loop0): Unrecognized mount option "01777777777777777777777" or missing value
Process accounting resumed
Process accounting resumed
FAT-fs (loop6): Unrecognized mount option "01777777777777777777777" or missing value
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
tmpfs: Unsupported parameter 'huge'
tmpfs: Unsupported parameter 'huge'
tmpfs: Unsupported parameter 'huge'
EXT4-fs: Invalid commit interval -2147483648, must be smaller than 2147483
EXT4-fs: Invalid commit interval -2147483648, must be smaller than 2147483
tmpfs: Unsupported parameter 'huge'
EXT4-fs: Invalid commit interval -2147483648, must be smaller than 2147483
tmpfs: Unsupported parameter 'huge'
EXT4-fs: Invalid commit interval -2147483648, must be smaller than 2147483
EXT4-fs: Invalid commit interval -2147483648, must be smaller than 2147483
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none.
EXT4-fs (loop0): unmounting filesystem.
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none.
EXT4-fs (loop0): unmounting filesystem.
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none.
EXT4-fs (loop0): unmounting filesystem.
loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none.
EXT4-fs (loop0): unmounting filesystem.
loop7: detected capacity change from 0 to 1024
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop7): unmounting filesystem.
loop7: detected capacity change from 0 to 1024
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop7): unmounting filesystem.
loop7: detected capacity change from 0 to 1024
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop7): unmounting filesystem.
loop7: detected capacity change from 0 to 1024
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop7): unmounting filesystem.
netlink: 'syz-executor.2': attribute type 11 has an invalid length.
audit: type=1400 audit(2000000003.883:10): avc: denied { write } for pid=4470 comm="syz-executor.7" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
netlink: 'syz-executor.2': attribute type 11 has an invalid length.
netlink: 'syz-executor.2': attribute type 11 has an invalid length.
netlink: 'syz-executor.2': attribute type 11 has an invalid length.