====================================================== WARNING: possible circular locking dependency detected 6.0.0-next-20221006 #1 Not tainted ------------------------------------------------------ syz-executor.4/5835 is trying to acquire lock: ffffffff853fac98 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70 but task is already holding lock: ffff88803e984c20 (&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 vprintk_emit+0x1bd/0x560 vprintk+0x84/0xa0 _printk+0xba/0xf1 kauditd_hold_skb.cold+0x3f/0x4e kauditd_send_queue+0x233/0x290 kauditd_thread+0x5f9/0x9c0 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 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.4/5835: #0: ffff88806cf37e98 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470 #1: ffff88803e984c20 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0 stack backtrace: CPU: 1 PID: 5835 Comm: syz-executor.4 Not tainted 6.0.0-next-20221006 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 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 5b a5 ef ff e8 56 a5 ef ff 65 8b 1d 1b fe ab 7e 31 ff 89 de e8 f6 a1 ef ff 85 db 0f 84 8a 00 00 00 e8 39 a5 ef ff <0f> 0b e9 a5 fe ff ff e8 2d a5 ef ff 48 8d 7d 10 48 b8 00 00 00 00 RSP: 0018:ffff888040117c48 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888040058000 RSI: ffffffff815677b7 RDI: 0000000000000005 RBP: ffff888040118000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865b605b R12: ffff88803e984c00 R13: ffff88806cf3d2c0 R14: ffffffff8547d200 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: 0033:0x7f60a0b3bb19 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:00007f609e0b1218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f60a0c4ef68 RCX: 00007f60a0b3bb19 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f60a0c4ef6c RBP: 00007f60a0c4ef60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f60a0c4ef6c R13: 00007ffc67b9a44f R14: 00007f609e0b1300 R15: 0000000000022000 WARNING: CPU: 1 PID: 5835 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460 Modules linked in: CPU: 1 PID: 5835 Comm: syz-executor.4 Not tainted 6.0.0-next-20221006 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:group_sched_out.part.0+0x2c7/0x460 Code: 5e 41 5f e9 5b a5 ef ff e8 56 a5 ef ff 65 8b 1d 1b fe ab 7e 31 ff 89 de e8 f6 a1 ef ff 85 db 0f 84 8a 00 00 00 e8 39 a5 ef ff <0f> 0b e9 a5 fe ff ff e8 2d a5 ef ff 48 8d 7d 10 48 b8 00 00 00 00 RSP: 0018:ffff888040117c48 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888040058000 RSI: ffffffff815677b7 RDI: 0000000000000005 RBP: ffff888040118000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865b605b R12: ffff88803e984c00 R13: ffff88806cf3d2c0 R14: ffffffff8547d200 R15: 0000000000000002 FS: 00007f609e0b1700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f651cee6018 CR3: 0000000032b1e000 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: 0033:0x7f60a0b3bb19 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:00007f609e0b1218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f60a0c4ef68 RCX: 00007f60a0b3bb19 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f60a0c4ef6c RBP: 00007f60a0c4ef60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f60a0c4ef6c R13: 00007ffc67b9a44f R14: 00007f609e0b1300 R15: 0000000000022000 irq event stamp: 290 hardirqs last enabled at (289): [] exit_to_user_mode_prepare+0x109/0x1a0 hardirqs last disabled at (290): [] __schedule+0x1225/0x2470 softirqs last enabled at (198): [] __irq_exit_rcu+0x11b/0x180 softirqs last disabled at (59): [] __irq_exit_rcu+0x11b/0x180 ---[ end trace 0000000000000000 ]--- audit: type=1400 audit(1665054246.414:9): avc: denied { write } for pid=5834 comm="syz-executor.4" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 audit: type=1400 audit(1665054246.546:10): avc: denied { block_suspend } for pid=5827 comm="syz-executor.0" capability=36 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 hrtimer: interrupt took 18856 ns syz-executor.4 (5894) used greatest stack depth: 23576 bytes left syz-executor.4 (5912) used greatest stack depth: 23384 bytes left loop4: detected capacity change from 0 to 40 loop4: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed loop4: detected capacity change from 0 to 40 loop0: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed loop4: detected capacity change from 0 to 40 loop0: detected capacity change from 0 to 40 loop3: detected capacity change from 0 to 40 loop2: detected capacity change from 0 to 40 loop5: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed loop4: detected capacity change from 0 to 40 Process accounting resumed loop0: detected capacity change from 0 to 40 loop7: detected capacity change from 0 to 40 loop2: detected capacity change from 0 to 40 loop5: detected capacity change from 0 to 40 loop1: detected capacity change from 0 to 40 loop3: detected capacity change from 0 to 40 loop4: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed loop6: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed loop3: detected capacity change from 0 to 40 loop2: detected capacity change from 0 to 40 Process accounting resumed loop7: detected capacity change from 0 to 40 loop4: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed loop1: detected capacity change from 0 to 40 Process accounting resumed loop7: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed loop5: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed loop6: detected capacity change from 0 to 40 Process accounting resumed loop1: detected capacity change from 0 to 40 Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed loop1: detected capacity change from 0 to 136 loop4: 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 loop1: detected capacity change from 0 to 136 Process accounting resumed Process accounting resumed Process accounting resumed loop1: detected capacity change from 0 to 136 Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed loop1: detected capacity change from 0 to 136 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 loop1: detected capacity change from 0 to 2048 EXT4-fs (loop1): inodes count not valid: 196640 vs 32 loop1: detected capacity change from 0 to 2048 EXT4-fs (loop1): inodes count not valid: 196640 vs 32 loop1: detected capacity change from 0 to 2048 EXT4-fs (loop1): inodes count not valid: 196640 vs 32 loop1: detected capacity change from 0 to 2048 EXT4-fs (loop1): inodes count not valid: 196640 vs 32 loop1: detected capacity change from 0 to 2048 EXT4-fs (loop1): inodes count not valid: 196640 vs 32