audit: type=1400 audit(1663765121.234:8): avc: denied { kernel } for pid=3856 comm="syz-executor.6" 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-20220921 #1 Not tainted ------------------------------------------------------ syz-executor.6/3857 is trying to acquire lock: ffffffff853faab8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0xe/0x70 but task is already holding lock: ffff88800e999820 (&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/0x1930 up+0x75/0xb0 __up_console_sem+0x6e/0x80 console_unlock+0x46a/0x590 vt_ioctl+0x2822/0x2ca0 tty_ioctl+0x7c4/0x1700 __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 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 __fget_light+0x7d/0x280 sockfd_lookup_light+0x1e/0x180 __sys_sendmmsg+0xfa/0x460 __x64_sys_sendmmsg+0x99/0x100 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.6/3857: #0: ffff88806cf3d160 (&cpuctx_lock){-...}-{2:2}, at: event_function+0x16f/0x3d0 #1: ffff88800e999820 (&ctx->lock){-...}-{2:2}, at: event_function+0x182/0x3d0 stack backtrace: CPU: 1 PID: 3857 Comm: syz-executor.6 Not tainted 6.0.0-rc6-next-20220921 #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 a2 59 ee ff 65 44 8b 25 36 b2 aa 7e 31 ff 44 89 e6 e8 40 56 ee ff 45 85 e4 0f 84 0a 05 00 00 e8 82 59 ee ff <0f> 0b e9 a9 f8 ff ff e8 76 59 ee ff 65 8b 1d 0b b2 aa 7e 31 ff 89 RSP: 0018:ffff88806cf09e60 EFLAGS: 00010046 RAX: 0000000080010002 RBX: ffff88803cfe85c8 RCX: 0000000000000000 RDX: ffff88801b4b3580 RSI: ffffffff8157c39e RDI: 0000000000000005 RBP: ffff88803cfe85c8 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865b005b R12: 0000000000000000 R13: ffff88803cfe8658 R14: ffff88800e999800 R15: ffff88803cfe85c8 __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:__fget_light+0x7d/0x280 Code: b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a7 01 00 00 41 8b 1c 24 01 00 00 00 89 de e8 f7 66 c0 ff 83 fb 01 74 65 e8 3d 6a c0 ff RSP: 0018:ffff88803d6afc90 EFLAGS: 00000246 RAX: 0000000000000003 RBX: 0000000000000004 RCX: ffffffff8185b29f RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88803ae49a40 RBP: 0000000000000005 R08: 0000000000000000 R09: ffff88803ae49a43 R10: ffffed10075c9348 R11: 0000000000000001 R12: ffff88803ae49a40 R13: 0000000000004000 R14: 0000000000000001 R15: 0000000000000000 sockfd_lookup_light+0x1e/0x180 __sys_sendmmsg+0xfa/0x460 __x64_sys_sendmmsg+0x99/0x100 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7faa1a1fcb19 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:00007faa17772188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007faa1a30ff60 RCX: 00007faa1a1fcb19 RDX: 0000000000000001 RSI: 0000000020001cc0 RDI: 0000000000000005 RBP: 00007faa1a256f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff91ef20af R14: 00007faa17772300 R15: 0000000000022000 WARNING: CPU: 1 PID: 3857 at kernel/events/core.c:2047 perf_group_detach+0x99e/0x12f0 Modules linked in: CPU: 1 PID: 3857 Comm: syz-executor.6 Not tainted 6.0.0-rc6-next-20220921 #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 a2 59 ee ff 65 44 8b 25 36 b2 aa 7e 31 ff 44 89 e6 e8 40 56 ee ff 45 85 e4 0f 84 0a 05 00 00 e8 82 59 ee ff <0f> 0b e9 a9 f8 ff ff e8 76 59 ee ff 65 8b 1d 0b b2 aa 7e 31 ff 89 RSP: 0018:ffff88806cf09e60 EFLAGS: 00010046 RAX: 0000000080010002 RBX: ffff88803cfe85c8 RCX: 0000000000000000 RDX: ffff88801b4b3580 RSI: ffffffff8157c39e RDI: 0000000000000005 RBP: ffff88803cfe85c8 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865b005b R12: 0000000000000000 R13: ffff88803cfe8658 R14: ffff88800e999800 R15: ffff88803cfe85c8 FS: 00007faa17772700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd5d34321f0 CR3: 0000000030192000 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:__fget_light+0x7d/0x280 Code: b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a7 01 00 00 41 8b 1c 24 01 00 00 00 89 de e8 f7 66 c0 ff 83 fb 01 74 65 e8 3d 6a c0 ff RSP: 0018:ffff88803d6afc90 EFLAGS: 00000246 RAX: 0000000000000003 RBX: 0000000000000004 RCX: ffffffff8185b29f RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88803ae49a40 RBP: 0000000000000005 R08: 0000000000000000 R09: ffff88803ae49a43 R10: ffffed10075c9348 R11: 0000000000000001 R12: ffff88803ae49a40 R13: 0000000000004000 R14: 0000000000000001 R15: 0000000000000000 sockfd_lookup_light+0x1e/0x180 __sys_sendmmsg+0xfa/0x460 __x64_sys_sendmmsg+0x99/0x100 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7faa1a1fcb19 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:00007faa17772188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007faa1a30ff60 RCX: 00007faa1a1fcb19 RDX: 0000000000000001 RSI: 0000000020001cc0 RDI: 0000000000000005 RBP: 00007faa1a256f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff91ef20af R14: 00007faa17772300 R15: 0000000000022000 irq event stamp: 2452 hardirqs last enabled at (2451): [] syscall_enter_from_user_mode+0x1d/0x50 hardirqs last disabled at (2452): [] sysvec_call_function_single+0xb/0xc0 softirqs last enabled at (2436): [] do_tcp_setsockopt+0x245/0x25c0 softirqs last disabled at (2434): [] release_sock+0x1b/0x1b0 ---[ end trace 0000000000000000 ]--- audit: type=1400 audit(1663765124.469:9): avc: denied { write } for pid=3975 comm="syz-executor.5" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 hrtimer: interrupt took 16872 ns loop2: detected capacity change from 0 to 32765 FAT-fs (loop2): invalid media value (0x17) FAT-fs (loop2): Can't find a valid FAT filesystem loop5: detected capacity change from 0 to 32765 FAT-fs (loop5): invalid media value (0x17) FAT-fs (loop5): Can't find a valid FAT filesystem loop2: detected capacity change from 0 to 32765 FAT-fs (loop2): invalid media value (0x17) FAT-fs (loop2): Can't find a valid FAT filesystem I/O error, dev loop2, sector 32512 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2 loop5: detected capacity change from 0 to 32765 loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): mounted filesystem without journal. Quota mode: none. EXT4-fs (loop7): unmounting filesystem. ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff (bad) 8: df 48 c1 fisttps -0x3f(%rax) b: ea (bad) c: 03 0f add (%rdi),%ecx e: b6 14 mov $0x14,%dh 10: 02 4c 89 e0 add -0x20(%rcx,%rcx,4),%cl 14: 83 e0 07 and $0x7,%eax 17: 83 c0 03 add $0x3,%eax 1a: 38 d0 cmp %dl,%al 1c: 7c 08 jl 0x26 1e: 84 d2 test %dl,%dl 20: 0f 85 a7 01 00 00 jne 0x1cd 26: 41 8b 1c 24 mov (%r12),%ebx * 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction 2f: 89 de mov %ebx,%esi 31: e8 f7 66 c0 ff callq 0xffc0672d 36: 83 fb 01 cmp $0x1,%ebx 39: 74 65 je 0xa0 3b: e8 3d 6a c0 ff callq 0xffc06a7d