WARNING: possible circular locking dependency detected
6.0.0-rc7-next-20220930 #1 Not tainted
------------------------------------------------------
syz-executor.3/4040 is trying to acquire lock:
ffffffff853faab8 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70
but task is already holding lock:
ffff8880092eac20 (&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
vt_ioctl+0x2822/0x2ca0
tty_ioctl+0x785/0x16b0
__x64_sys_ioctl+0x19a/0x210
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.3/4040:
#0: ffff88806ce37e98 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470
#1: ffff8880092eac20 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0
stack backtrace:
CPU: 0 PID: 4040 Comm: syz-executor.3 Not tainted 6.0.0-rc7-next-20220930 #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 0b 18 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:ffff8880400ffc48 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880400f0000 RSI: ffffffff81565dc7 RDI: 0000000000000005
RBP: ffff888008660000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880092eac00
R13: ffff88806ce3d2c0 R14: ffffffff8547c960 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: 0033:0x7f084891ab19
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:00007f0845e90218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f0848a2df68 RCX: 00007f084891ab19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f0848a2df6c
RBP: 00007f0848a2df60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007f0848a2df6c
R13: 00007ffce8337f6f R14: 00007f0845e90300 R15: 0000000000022000
WARNING: CPU: 0 PID: 4040 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460
Modules linked in:
CPU: 0 PID: 4040 Comm: syz-executor.3 Not tainted 6.0.0-rc7-next-20220930 #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 0b 18 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:ffff8880400ffc48 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880400f0000 RSI: ffffffff81565dc7 RDI: 0000000000000005
RBP: ffff888008660000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880092eac00
R13: ffff88806ce3d2c0 R14: ffffffff8547c960 R15: 0000000000000002
FS: 00007f0845e90700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca9aaac3a4 CR3: 000000003b8aa000 CR4: 0000000000350ef0
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: 0033:0x7f084891ab19
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:00007f0845e90218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f0848a2df68 RCX: 00007f084891ab19
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f0848a2df6c
RBP: 00007f0848a2df60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007f0848a2df6c
R13: 00007ffce8337f6f R14: 00007f0845e90300 R15: 0000000000022000
irq event stamp: 1520
hardirqs last enabled at (1519): [] exit_to_user_mode_prepare+0x109/0x1a0
hardirqs last disabled at (1520): [] __schedule+0x1225/0x2470
softirqs last enabled at (1408): [] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (1399): [] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
netlink: 'syz-executor.3': attribute type 1 has an invalid length.
netlink: 'syz-executor.3': attribute type 1 has an invalid length.
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
hrtimer: interrupt took 18565 ns
device syz_tun entered promiscuous mode
device syz_tun left promiscuous mode
loop2: detected capacity change from 0 to 320
ISO 9660 Extensions: Microsoft Joliet Level 3
ISO 9660 Extensions: RRIP_1991A
loop3: detected capacity change from 0 to 5392
loop7: detected capacity change from 0 to 40
loop7: detected capacity change from 0 to 40
Process accounting resumed
Process accounting resumed
Process accounting resumed
loop7: detected capacity change from 0 to 40
loop6: detected capacity change from 0 to 40
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
loop6: detected capacity change from 0 to 40
loop7: detected capacity change from 0 to 40
Process accounting resumed
Process accounting resumed
Process accounting resumed
loop6: detected capacity change from 0 to 40
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
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
Process accounting resumed
netlink: 1 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 1 bytes leftover after parsing attributes in process `syz-executor.5'.
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
netlink: 1 bytes leftover after parsing attributes in process `syz-executor.5'.
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
Process accounting resumed
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
netlink: 1 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 1 bytes leftover after parsing attributes in process `syz-executor.5'.
loop2: detected capacity change from 0 to 4096
EXT4-fs (loop2): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop2): unmounting filesystem.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.6'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.6'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'.
netlink: 28 bytes leftover after parsing attributes in process `syz-executor.6'.
tmpfs: Bad value for 'mpol'
tmpfs: Bad value for 'mpol'
loop3: detected capacity change from 0 to 264192
FAT-fs (loop3): Unrecognized mount option "fsname=&*:[\" or missing value
loop3: detected capacity change from 0 to 264192
FAT-fs (loop3): Unrecognized mount option "fsname=&*:[\" or missing value
loop6: detected capacity change from 0 to 264192
loop3: detected capacity change from 0 to 264192
FAT-fs (loop3): Unrecognized mount option "fsname=&*:[\" or missing value
loop6: detected capacity change from 0 to 264192