audit: type=1400 audit(1663241818.364:8): avc: denied { kernel } for pid=3763 comm="syz-executor.3" 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-rc5-next-20220915 #1 Not tainted ------------------------------------------------------ syz-executor.3/3765 is trying to acquire lock: ffffffff853fa878 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0xe/0x70 but task is already holding lock: ffff88800e69a820 (&ctx->lock){-...}-{2:2}, at: event_function+0x182/0x3d0 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 perf_group_detach+0x99e/0x12f0 __perf_remove_from_context+0x71e/0xb20 event_function+0x297/0x3d0 remote_function+0x125/0x1b0 __flush_smp_call_function_queue+0x1df/0x5a0 __sysvec_call_function_single+0x92/0x3a0 sysvec_call_function_single+0x89/0xc0 asm_sysvec_call_function_single+0x16/0x20 unwind_next_frame+0xe12/0x20b0 arch_stack_walk+0x83/0xf0 stack_trace_save+0x8c/0xc0 kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_slab_alloc+0x58/0x70 kmem_cache_alloc+0x1b1/0x3e0 getname_flags.part.0+0x50/0x4f0 getname_flags+0x9a/0xe0 user_path_at_empty+0x2b/0x60 __x64_sys_mount+0x1e9/0x300 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.3/3765: #0: ffff88806cf3d120 (&cpuctx_lock){-...}-{2:2}, at: event_function+0x16f/0x3d0 #1: ffff88800e69a820 (&ctx->lock){-...}-{2:2}, at: event_function+0x182/0x3d0 stack backtrace: CPU: 1 PID: 3765 Comm: syz-executor.3 Not tainted 6.0.0-rc5-next-20220915 #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:perf_group_detach+0x99e/0x12f0 Code: 85 d5 f8 ff ff e8 22 57 ee ff 65 44 8b 25 96 b5 aa 7e 31 ff 44 89 e6 e8 c0 53 ee ff 45 85 e4 0f 84 0a 05 00 00 e8 02 57 ee ff <0f> 0b e9 a9 f8 ff ff e8 f6 56 ee ff 65 8b 1d 6b b5 aa 7e 31 ff 89 RSP: 0018:ffff88806cf09e60 EFLAGS: 00010046 RAX: 0000000080010002 RBX: ffff88800d5585c8 RCX: 0000000000000000 RDX: ffff88801d825040 RSI: ffffffff8157c03e RDI: 0000000000000005 RBP: ffff88800d5585c8 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865ac05b R12: 0000000000000000 R13: ffff88800d558658 R14: ffff88800e69a800 R15: ffff88800d5585c8 __perf_remove_from_context+0x71e/0xb20 event_function+0x297/0x3d0 remote_function+0x125/0x1b0 __flush_smp_call_function_queue+0x1df/0x5a0 __sysvec_call_function_single+0x92/0x3a0 sysvec_call_function_single+0x89/0xc0 asm_sysvec_call_function_single+0x16/0x20 RIP: 0010:unwind_next_frame+0xe12/0x20b0 Code: c0 74 08 3c 03 0f 8e aa 0e 00 00 41 3b 1e 0f 84 6a 07 00 00 bf 01 00 00 00 e8 7a 77 0e 00 b8 01 00 00 00 65 8b 15 9e ad f0 7e <85> d2 0f 85 21 f2 ff ff 0f 1f 44 00 00 e9 17 f2 ff ff 48 8b 74 24 RSP: 0018:ffff88803ce7f9a8 EFLAGS: 00000297 RAX: 0000000000000001 RBX: ffff88803ce7fb60 RCX: 0000000000000000 RDX: 0000000080000000 RSI: ffff88803ce7fb58 RDI: 0000000000000001 RBP: ffff88803ce78000 R08: ffffffff85e7ac74 R09: ffffffff85e7ac78 R10: ffffed10079cff52 R11: ffff88803ce7fa68 R12: ffff88803ce7fa69 R13: ffff88803ce7fa88 R14: ffff88803ce7fa28 R15: 0000000000000001 arch_stack_walk+0x83/0xf0 stack_trace_save+0x8c/0xc0 kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_slab_alloc+0x58/0x70 kmem_cache_alloc+0x1b1/0x3e0 getname_flags.part.0+0x50/0x4f0 getname_flags+0x9a/0xe0 user_path_at_empty+0x2b/0x60 __x64_sys_mount+0x1e9/0x300 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f60f32a004a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f60f0813fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f60f32a004a RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f60f0814040 R08: 00007f60f0814040 R09: 0000000020000200 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000200 R13: 0000000020000000 R14: 00007f60f0814000 R15: 0000000020000400 WARNING: CPU: 1 PID: 3765 at kernel/events/core.c:2047 perf_group_detach+0x99e/0x12f0 Modules linked in: CPU: 1 PID: 3765 Comm: syz-executor.3 Not tainted 6.0.0-rc5-next-20220915 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:perf_group_detach+0x99e/0x12f0 Code: 85 d5 f8 ff ff e8 22 57 ee ff 65 44 8b 25 96 b5 aa 7e 31 ff 44 89 e6 e8 c0 53 ee ff 45 85 e4 0f 84 0a 05 00 00 e8 02 57 ee ff <0f> 0b e9 a9 f8 ff ff e8 f6 56 ee ff 65 8b 1d 6b b5 aa 7e 31 ff 89 RSP: 0018:ffff88806cf09e60 EFLAGS: 00010046 RAX: 0000000080010002 RBX: ffff88800d5585c8 RCX: 0000000000000000 RDX: ffff88801d825040 RSI: ffffffff8157c03e RDI: 0000000000000005 RBP: ffff88800d5585c8 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865ac05b R12: 0000000000000000 R13: ffff88800d558658 R14: ffff88800e69a800 R15: ffff88800d5585c8 FS: 00007f60f0814700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f60f0815000 CR3: 000000003d664000 CR4: 0000000000350ee0 Call Trace: __perf_remove_from_context+0x71e/0xb20 event_function+0x297/0x3d0 remote_function+0x125/0x1b0 __flush_smp_call_function_queue+0x1df/0x5a0 __sysvec_call_function_single+0x92/0x3a0 sysvec_call_function_single+0x89/0xc0 asm_sysvec_call_function_single+0x16/0x20 RIP: 0010:unwind_next_frame+0xe12/0x20b0 Code: c0 74 08 3c 03 0f 8e aa 0e 00 00 41 3b 1e 0f 84 6a 07 00 00 bf 01 00 00 00 e8 7a 77 0e 00 b8 01 00 00 00 65 8b 15 9e ad f0 7e <85> d2 0f 85 21 f2 ff ff 0f 1f 44 00 00 e9 17 f2 ff ff 48 8b 74 24 RSP: 0018:ffff88803ce7f9a8 EFLAGS: 00000297 RAX: 0000000000000001 RBX: ffff88803ce7fb60 RCX: 0000000000000000 RDX: 0000000080000000 RSI: ffff88803ce7fb58 RDI: 0000000000000001 RBP: ffff88803ce78000 R08: ffffffff85e7ac74 R09: ffffffff85e7ac78 R10: ffffed10079cff52 R11: ffff88803ce7fa68 R12: ffff88803ce7fa69 R13: ffff88803ce7fa88 R14: ffff88803ce7fa28 R15: 0000000000000001 arch_stack_walk+0x83/0xf0 stack_trace_save+0x8c/0xc0 kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_slab_alloc+0x58/0x70 kmem_cache_alloc+0x1b1/0x3e0 getname_flags.part.0+0x50/0x4f0 getname_flags+0x9a/0xe0 user_path_at_empty+0x2b/0x60 __x64_sys_mount+0x1e9/0x300 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f60f32a004a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007f60f0813fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f60f32a004a RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f60f0814040 R08: 00007f60f0814040 R09: 0000000020000200 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000200 R13: 0000000020000000 R14: 00007f60f0814000 R15: 0000000020000400 irq event stamp: 1704 hardirqs last enabled at (1703): [] exc_page_fault+0xc4/0x1a0 hardirqs last disabled at (1704): [] sysvec_call_function_single+0xb/0xc0 softirqs last enabled at (1106): [] __irq_exit_rcu+0x11b/0x180 softirqs last disabled at (1101): [] __irq_exit_rcu+0x11b/0x180 ---[ end trace 0000000000000000 ]--- ALSA: seq fatal error: cannot create timer (-22) ALSA: seq fatal error: cannot create timer (-22) FAT-fs (loop7): bogus number of reserved sectors FAT-fs (loop7): Can't find a valid FAT filesystem FAT-fs (loop7): bogus number of reserved sectors FAT-fs (loop7): Can't find a valid FAT filesystem hrtimer: interrupt took 19326 ns ALSA: seq fatal error: cannot create timer (-22) FAT-fs (loop7): bogus number of reserved sectors FAT-fs (loop7): Can't find a valid FAT filesystem ALSA: seq fatal error: cannot create timer (-22) FAT-fs (loop7): bogus number of reserved sectors FAT-fs (loop7): Can't find a valid FAT filesystem ALSA: seq fatal error: cannot create timer (-22) FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem ALSA: seq fatal error: cannot create timer (-22) ALSA: seq fatal error: cannot create timer (-22) ALSA: seq fatal error: cannot create timer (-22) FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop7): bogus number of reserved sectors FAT-fs (loop7): Can't find a valid FAT filesystem FAT-fs (loop4): bogus number of reserved sectors FAT-fs (loop4): Can't find a valid FAT filesystem FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem loop4: detected capacity change from 0 to 344 loop3: detected capacity change from 0 to 352 loop7: detected capacity change from 0 to 320 ISO 9660 Extensions: Microsoft Joliet Level 3 ISO 9660 Extensions: RRIP_1991A loop5: detected capacity change from 0 to 3520 loop6: detected capacity change from 0 to 264192 loop6: detected capacity change from 0 to 264192 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 ---------------- Code disassembly (best guess): 0: c0 74 08 3c 03 shlb $0x3,0x3c(%rax,%rcx,1) 5: 0f 8e aa 0e 00 00 jle 0xeb5 b: 41 3b 1e cmp (%r14),%ebx e: 0f 84 6a 07 00 00 je 0x77e 14: bf 01 00 00 00 mov $0x1,%edi 19: e8 7a 77 0e 00 callq 0xe7798 1e: b8 01 00 00 00 mov $0x1,%eax 23: 65 8b 15 9e ad f0 7e mov %gs:0x7ef0ad9e(%rip),%edx # 0x7ef0adc8 * 2a: 85 d2 test %edx,%edx <-- trapping instruction 2c: 0f 85 21 f2 ff ff jne 0xfffff253 32: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 37: e9 17 f2 ff ff jmpq 0xfffff253 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 74 24 je 0x64