audit: type=1400 audit(1664334434.463:8): avc:  denied  { kernel } for  pid=3630 comm="syz-executor.1" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc7-next-20220927 #1 Not tainted
------------------------------------------------------
syz-executor.1/3632 is trying to acquire lock:
ffffffff853faab8 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70

but task is already holding lock:
ffff8880101ce820 (&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
       futex_wait_queue+0xf5/0x1e0
       futex_wait+0x28e/0x690
       do_futex+0x2ff/0x380
       __x64_sys_futex+0x1c6/0x4d0
       do_syscall_64+0x3b/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
       futex_wait_queue+0xf5/0x1e0
       futex_wait+0x28e/0x690
       do_futex+0x2ff/0x380
       __x64_sys_futex+0x1c6/0x4d0
       do_syscall_64+0x3b/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.1/3632:
 #0: ffff88806ce37d18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470
 #1: ffff8880101ce820 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0

stack backtrace:
CPU: 0 PID: 3632 Comm: syz-executor.1 Not tainted 6.0.0-rc7-next-20220927 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
 <TASK>
 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 ab a9 ef ff e8 a6 a9 ef ff 65 8b 1d 1b 0f ac 7e 31 ff 89 de e8 46 a6 ef ff 85 db 0f 84 8a 00 00 00 e8 89 a9 ef ff <0f> 0b e9 a5 fe ff ff e8 7d a9 ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff88803fd578f8 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888010013580 RSI: ffffffff815666b7 RDI: 0000000000000005
RBP: ffff888008660000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865b401b R12: ffff8880101ce800
R13: ffff88806ce3d140 R14: ffffffff8547cf80 R15: 0000000000000002
 ctx_sched_out+0x8f1/0xc10
 __perf_event_task_sched_out+0x6d0/0x18d0
 __schedule+0xedd/0x2470
 schedule+0xda/0x1b0
 futex_wait_queue+0xf5/0x1e0
 futex_wait+0x28e/0x690
 do_futex+0x2ff/0x380
 __x64_sys_futex+0x1c6/0x4d0
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa9d9fcdb19
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:00007fa9d7543218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fa9da0e0f68 RCX: 00007fa9d9fcdb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa9da0e0f68
RBP: 00007fa9da0e0f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa9da0e0f6c
R13: 00007ffc560de84f R14: 00007fa9d7543300 R15: 0000000000022000
 </TASK>
WARNING: CPU: 0 PID: 3632 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460
Modules linked in:
CPU: 0 PID: 3632 Comm: syz-executor.1 Not tainted 6.0.0-rc7-next-20220927 #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 ab a9 ef ff e8 a6 a9 ef ff 65 8b 1d 1b 0f ac 7e 31 ff 89 de e8 46 a6 ef ff 85 db 0f 84 8a 00 00 00 e8 89 a9 ef ff <0f> 0b e9 a5 fe ff ff e8 7d a9 ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff88803fd578f8 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888010013580 RSI: ffffffff815666b7 RDI: 0000000000000005
RBP: ffff888008660000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865b401b R12: ffff8880101ce800
R13: ffff88806ce3d140 R14: ffffffff8547cf80 R15: 0000000000000002
FS:  00007fa9d7543700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6b6ab0000 CR3: 000000003e4f6000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ctx_sched_out+0x8f1/0xc10
 __perf_event_task_sched_out+0x6d0/0x18d0
 __schedule+0xedd/0x2470
 schedule+0xda/0x1b0
 futex_wait_queue+0xf5/0x1e0
 futex_wait+0x28e/0x690
 do_futex+0x2ff/0x380
 __x64_sys_futex+0x1c6/0x4d0
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa9d9fcdb19
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:00007fa9d7543218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fa9da0e0f68 RCX: 00007fa9d9fcdb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa9da0e0f68
RBP: 00007fa9da0e0f60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa9da0e0f6c
R13: 00007ffc560de84f R14: 00007fa9d7543300 R15: 0000000000022000
 </TASK>
irq event stamp: 846
hardirqs last  enabled at (845): [<ffffffff842505ed>] syscall_enter_from_user_mode+0x1d/0x50
hardirqs last disabled at (846): [<ffffffff842598f5>] __schedule+0x1225/0x2470
softirqs last  enabled at (508): [<ffffffff8116fa0b>] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (503): [<ffffffff8116fa0b>] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
hrtimer: interrupt took 17873 ns
syz-executor.1 (3655) used greatest stack depth: 24408 bytes left
EXT4-fs (loop5): VFS: Can't find ext4 filesystem
EXT4-fs (loop5): VFS: Can't find ext4 filesystem
device lo entered promiscuous mode
netlink: 'syz-executor.6': attribute type 49 has an invalid length.
device lo left promiscuous mode
netlink: 'syz-executor.6': attribute type 49 has an invalid length.
device lo entered promiscuous mode
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netlink: 'syz-executor.6': attribute type 49 has an invalid length.
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syz-executor.5 (3990) used greatest stack depth: 23768 bytes left
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netlink: 'syz-executor.6': attribute type 49 has an invalid length.
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