audit: type=1400 audit(1663596651.224:8): avc:  denied  { kernel } for  pid=4023 comm="syz-executor.2" 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-rc6-next-20220919 #1 Not tainted
------------------------------------------------------
syz-executor.2/4034 is trying to acquire lock:
ffffffff853fa838 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70

but task is already holding lock:
ffff888017c36c20 (&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+0x4c1/0x4e6
       secondary_startup_64_no_verify+0xe0/0xeb

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       _raw_spin_lock_irqsave+0x39/0x60
       try_to_wake_up+0xab/0x1920
       up+0x75/0xb0
       __up_console_sem+0x6e/0x80
       console_unlock+0x46a/0x590
       vprintk_emit+0x1bd/0x560
       vprintk+0x84/0xa0
       _printk+0xba/0xf1
       kauditd_hold_skb.cold+0x3f/0x4e
       kauditd_send_queue+0x233/0x290
       kauditd_thread+0x5da/0x9a0
       kthread+0x2ed/0x3a0
       ret_from_fork+0x22/0x30

-> #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.2/4034:
 #0: ffff88806ce37d18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470
 #1: ffff888017c36c20 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0

stack backtrace:
CPU: 0 PID: 4034 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220919 #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 3b b7 ef ff e8 36 b7 ef ff 65 8b 1d 5b 15 ac 7e 31 ff 89 de e8 d6 b3 ef ff 85 db 0f 84 8a 00 00 00 e8 19 b7 ef ff <0f> 0b e9 a5 fe ff ff e8 0d b7 ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff88804169f8f8 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801e0d0000 RSI: ffffffff81566077 RDI: 0000000000000005
RBP: ffff888008660000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865ac01b R12: ffff888017c36c00
R13: ffff88806ce3d140 R14: ffffffff8547c620 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: 0033:0x7fd75ae7cb19
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:00007fd7583f2218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fd75af8ff68 RCX: 00007fd75ae7cb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd75af8ff68
RBP: 00007fd75af8ff60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd75af8ff6c
R13: 00007ffd69423adf R14: 00007fd7583f2300 R15: 0000000000022000
 </TASK>
hrtimer: interrupt took 18425 ns
WARNING: CPU: 0 PID: 4034 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460
Modules linked in:
CPU: 0 PID: 4034 Comm: syz-executor.2 Not tainted 6.0.0-rc6-next-20220919 #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 3b b7 ef ff e8 36 b7 ef ff 65 8b 1d 5b 15 ac 7e 31 ff 89 de e8 d6 b3 ef ff 85 db 0f 84 8a 00 00 00 e8 19 b7 ef ff <0f> 0b e9 a5 fe ff ff e8 0d b7 ef ff 48 8d 7d 10 48 b8 00 00 00 00
RSP: 0018:ffff88804169f8f8 EFLAGS: 00010006
RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801e0d0000 RSI: ffffffff81566077 RDI: 0000000000000005
RBP: ffff888008660000 R08: 0000000000000005 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff865ac01b R12: ffff888017c36c00
R13: ffff88806ce3d140 R14: ffffffff8547c620 R15: 0000000000000002
FS:  00007fd7583f2700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2df26000 CR3: 000000004032c000 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
audit: type=1400 audit(1663596651.299:9): avc:  denied  { write } for  pid=4023 comm="syz-executor.2" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1
 do_syscall_64+0x3b/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd75ae7cb19
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:00007fd7583f2218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fd75af8ff68 RCX: 00007fd75ae7cb19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd75af8ff68
RBP: 00007fd75af8ff60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd75af8ff6c
R13: 00007ffd69423adf R14: 00007fd7583f2300 R15: 0000000000022000
 </TASK>
irq event stamp: 930
hardirqs last  enabled at (929): [<ffffffff842446bd>] syscall_enter_from_user_mode+0x1d/0x50
hardirqs last disabled at (930): [<ffffffff8424d995>] __schedule+0x1225/0x2470
softirqs last  enabled at (670): [<ffffffff8117063b>] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (633): [<ffffffff8117063b>] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.4'.
syz-executor.4: attempt to access beyond end of device
loop4: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop4, logical block 10, lost async page write
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.4'.
loop4: detected capacity change from 0 to 40
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.4'.
syz-executor.4: attempt to access beyond end of device
loop4: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop4, logical block 10, lost async page write
loop0: detected capacity change from 0 to 40
loop4: detected capacity change from 0 to 40
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.0'.
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.4'.
syz-executor.0: attempt to access beyond end of device
loop0: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop0, logical block 10, lost async page write
loop7: detected capacity change from 0 to 40
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.7'.
syz-executor.4: attempt to access beyond end of device
loop4: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop4, logical block 10, lost async page write
syz-executor.7: attempt to access beyond end of device
loop7: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop7, logical block 10, lost async page write
loop3: detected capacity change from 0 to 40
loop4: detected capacity change from 0 to 40
loop0: detected capacity change from 0 to 40
loop1: detected capacity change from 0 to 40
loop7: detected capacity change from 0 to 40
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.3'.
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.4'.
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.7'.
netlink: 4436 bytes leftover after parsing attributes in process `syz-executor.0'.
syz-executor.7: attempt to access beyond end of device
loop7: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop7, logical block 10, lost async page write
syz-executor.4: attempt to access beyond end of device
loop4: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop4, logical block 10, lost async page write
syz-executor.3: attempt to access beyond end of device
loop3: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop3, logical block 10, lost async page write
syz-executor.1: attempt to access beyond end of device
loop1: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop1, logical block 10, lost async page write
loop7: detected capacity change from 0 to 40
syz-executor.0: attempt to access beyond end of device
loop0: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop0, logical block 10, lost async page write
loop4: detected capacity change from 0 to 2048
loop1: detected capacity change from 0 to 40
loop0: detected capacity change from 0 to 40
loop3: detected capacity change from 0 to 40
EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop4): unmounting filesystem.
audit: type=1400 audit(1663596653.317:10): avc:  denied  { tracepoint } for  pid=4155 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
loop4: detected capacity change from 0 to 2048
EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop4): unmounting filesystem.
loop3: detected capacity change from 0 to 40
loop1: detected capacity change from 0 to 40
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.1 not setting count and/or reply_len properly
loop4: detected capacity change from 0 to 2048
EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop4): unmounting filesystem.
loop2: detected capacity change from 0 to 8
FAT-fs (loop2): Unrecognized mount option "uid<00000000000000000000" or missing value
loop2: detected capacity change from 0 to 8
FAT-fs (loop2): Unrecognized mount option "uid<00000000000000000000" or missing value
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.3 not setting count and/or reply_len properly
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.6 not setting count and/or reply_len properly
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.2 not setting count and/or reply_len properly
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.3 not setting count and/or reply_len properly
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.3 not setting count and/or reply_len properly
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.1 not setting count and/or reply_len properly
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.7 not setting count and/or reply_len properly
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.2 not setting count and/or reply_len properly
sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor.0 not setting count and/or reply_len properly
netlink: 'syz-executor.7': attribute type 1 has an invalid length.
netlink: 'syz-executor.7': attribute type 1 has an invalid length.
netlink: 'syz-executor.7': attribute type 1 has an invalid length.
netlink: 'syz-executor.7': attribute type 1 has an invalid length.
netlink: 'syz-executor.7': attribute type 1 has an invalid length.
audit: type=1326 audit(1663596659.262:11): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4466 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fd75ae7cb19 code=0x0
audit: type=1326 audit(1663596659.311:12): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4466 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=3 compat=0 ip=0x7fd75ae2f72b code=0x0
audit: type=1326 audit(1663596659.374:13): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4477 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fd75ae7cb19 code=0x0
audit: type=1326 audit(1663596659.424:14): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4477 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=3 compat=0 ip=0x7fd75ae2f72b code=0x0
audit: type=1326 audit(1663596659.506:15): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4487 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fd75ae7cb19 code=0x0
audit: type=1326 audit(1663596659.567:16): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4487 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=3 compat=0 ip=0x7fd75ae2f72b code=0x0
audit: type=1326 audit(1663596659.670:17): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4508 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fd75ae7cb19 code=0x0
audit: type=1326 audit(1663596659.719:18): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4508 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=3 compat=0 ip=0x7fd75ae2f72b code=0x0