audit: type=1400 audit(1664452841.578:9): avc: denied { read } for pid=3550 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-rc7-next-20220928 #1 Not tainted ------------------------------------------------------ syz-executor.2/3554 is trying to acquire lock: ffffffff853faab8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0xe/0x70 but task is already holding lock: ffff88800edfe820 (&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+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+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+0x12b/0x20b0 arch_stack_walk+0x83/0xf0 stack_trace_save+0x8c/0xc0 __create_object+0x389/0xc10 kmem_cache_alloc+0x235/0x3e0 security_file_alloc+0x34/0x170 __alloc_file+0xb6/0x240 alloc_empty_file+0x6d/0x170 path_openat+0xd4/0x2770 do_filp_open+0x1b6/0x410 do_sys_openat2+0x171/0x4c0 __x64_sys_openat+0x13f/0x1f0 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.2/3554: #0: ffff88806cf3f020 (&cpuctx_lock){-...}-{2:2}, at: event_function+0x16f/0x3d0 #1: ffff88800edfe820 (&ctx->lock){-...}-{2:2}, at: event_function+0x182/0x3d0 stack backtrace: CPU: 1 PID: 3554 Comm: syz-executor.2 Not tainted 6.0.0-rc7-next-20220928 #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 f2 49 ee ff 65 44 8b 25 06 b3 aa 7e 31 ff 44 89 e6 e8 90 46 ee ff 45 85 e4 0f 84 0a 05 00 00 e8 d2 49 ee ff <0f> 0b e9 a9 f8 ff ff e8 c6 49 ee ff 65 8b 1d db b2 aa 7e 31 ff 89 RSP: 0018:ffff88806cf09e60 EFLAGS: 00010046 RAX: 0000000080010003 RBX: ffff888039f805c8 RCX: 0000000000000000 RDX: ffff888040799ac0 RSI: ffffffff8157c2ce RDI: 0000000000000005 RBP: ffff888039f805c8 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865b405b R12: 0000000000000000 R13: ffff888039f80658 R14: ffff88800edfe800 R15: ffff888039f805c8 __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+0x12b/0x20b0 Code: 85 be 02 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8d 66 41 4c 89 e2 48 c1 ea 03 0f b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 c0 <0f> 85 2e 08 00 00 48 89 e9 41 0f b6 46 41 48 ba 00 00 00 00 00 fc RSP: 0018:ffff888040f77818 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffffffff0e0c0e0 RDX: 0000000000000001 RSI: ffffffff817bcf29 RDI: ffff88804079ae20 RBP: ffff888040f778f0 R08: ffffffff85e802e4 R09: ffffffff85e802e8 R10: ffffed10081eef20 R11: ffff888040f778d8 R12: ffff888040f778d9 R13: ffff888040f778f8 R14: ffff888040f77898 R15: ffff888014f94bd0 arch_stack_walk+0x83/0xf0 stack_trace_save+0x8c/0xc0 __create_object+0x389/0xc10 kmem_cache_alloc+0x235/0x3e0 security_file_alloc+0x34/0x170 __alloc_file+0xb6/0x240 alloc_empty_file+0x6d/0x170 path_openat+0xd4/0x2770 do_filp_open+0x1b6/0x410 do_sys_openat2+0x171/0x4c0 __x64_sys_openat+0x13f/0x1f0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8c00322b19 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:00007f8bfd898188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8c00435f60 RCX: 00007f8c00322b19 RDX: 0000000000101042 RSI: 0000000020000100 RDI: ffffffffffffff9c RBP: 00007f8c0037cf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff9ba93c6f R14: 00007f8bfd898300 R15: 0000000000022000 WARNING: CPU: 1 PID: 3554 at kernel/events/core.c:2047 perf_group_detach+0x99e/0x12f0 Modules linked in: CPU: 1 PID: 3554 Comm: syz-executor.2 Not tainted 6.0.0-rc7-next-20220928 #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 f2 49 ee ff 65 44 8b 25 06 b3 aa 7e 31 ff 44 89 e6 e8 90 46 ee ff 45 85 e4 0f 84 0a 05 00 00 e8 d2 49 ee ff <0f> 0b e9 a9 f8 ff ff e8 c6 49 ee ff 65 8b 1d db b2 aa 7e 31 ff 89 RSP: 0018:ffff88806cf09e60 EFLAGS: 00010046 RAX: 0000000080010003 RBX: ffff888039f805c8 RCX: 0000000000000000 RDX: ffff888040799ac0 RSI: ffffffff8157c2ce RDI: 0000000000000005 RBP: ffff888039f805c8 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865b405b R12: 0000000000000000 R13: ffff888039f80658 R14: ffff88800edfe800 R15: ffff888039f805c8 FS: 00007f8bfd898700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563027b1a080 CR3: 000000001546e000 CR4: 0000000000350fe0 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+0x12b/0x20b0 Code: 85 be 02 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8d 66 41 4c 89 e2 48 c1 ea 03 0f b6 04 02 4c 89 e2 83 e2 07 38 d0 7f 08 84 c0 <0f> 85 2e 08 00 00 48 89 e9 41 0f b6 46 41 48 ba 00 00 00 00 00 fc RSP: 0018:ffff888040f77818 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffffffff0e0c0e0 RDX: 0000000000000001 RSI: ffffffff817bcf29 RDI: ffff88804079ae20 RBP: ffff888040f778f0 R08: ffffffff85e802e4 R09: ffffffff85e802e8 R10: ffffed10081eef20 R11: ffff888040f778d8 R12: ffff888040f778d9 R13: ffff888040f778f8 R14: ffff888040f77898 R15: ffff888014f94bd0 arch_stack_walk+0x83/0xf0 stack_trace_save+0x8c/0xc0 __create_object+0x389/0xc10 kmem_cache_alloc+0x235/0x3e0 security_file_alloc+0x34/0x170 __alloc_file+0xb6/0x240 alloc_empty_file+0x6d/0x170 path_openat+0xd4/0x2770 do_filp_open+0x1b6/0x410 do_sys_openat2+0x171/0x4c0 __x64_sys_openat+0x13f/0x1f0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8c00322b19 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:00007f8bfd898188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8c00435f60 RCX: 00007f8c00322b19 RDX: 0000000000101042 RSI: 0000000020000100 RDI: ffffffffffffff9c RBP: 00007f8c0037cf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff9ba93c6f R14: 00007f8bfd898300 R15: 0000000000022000 irq event stamp: 3536 hardirqs last enabled at (3535): [] ___slab_alloc+0x86e/0x1080 hardirqs last disabled at (3536): [] sysvec_call_function_single+0xb/0xc0 softirqs last enabled at (2736): [] __irq_exit_rcu+0x11b/0x180 softirqs last disabled at (2497): [] __irq_exit_rcu+0x11b/0x180 ---[ end trace 0000000000000000 ]--- ISOFS: Unable to identify CD-ROM format. ISOFS: Unable to identify CD-ROM format. process 'syz-executor.2' launched './file0' with NULL argv: empty string added UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 00 00 add %al,(%rax) 2: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 9: fc ff df c: 4d 8d 66 41 lea 0x41(%r14),%r12 10: 4c 89 e2 mov %r12,%rdx 13: 48 c1 ea 03 shr $0x3,%rdx 17: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 1b: 4c 89 e2 mov %r12,%rdx 1e: 83 e2 07 and $0x7,%edx 21: 38 d0 cmp %dl,%al 23: 7f 08 jg 0x2d 25: 84 c0 test %al,%al * 27: 0f 85 2e 08 00 00 jne 0x85b <-- trapping instruction 2d: 48 89 e9 mov %rbp,%rcx 30: 41 0f b6 46 41 movzbl 0x41(%r14),%eax 35: 48 rex.W 36: ba 00 00 00 00 mov $0x0,%edx 3b: 00 fc add %bh,%ah