R10: 00007ffd0444da57 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffd0444ddd0 Call Trace: ====================================================== WARNING: possible circular locking dependency detected 5.16.0-rc4-next-20211206 #1 Not tainted ------------------------------------------------------ syz-executor.7/14301 is trying to acquire lock: ffffffff851f4dd8 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0xe/0x60 kernel/locking/semaphore.c:138 but task is already holding lock: ffff888040370820 (&ctx->lock){-.-.}-{2:2}, at: __perf_install_in_context+0x12d/0x310 kernel/events/core.c:2780 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ctx->lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 perf_event_context_sched_out kernel/events/core.c:3489 [inline] __perf_event_task_sched_out+0x519/0x1930 kernel/events/core.c:3597 perf_event_task_sched_out include/linux/perf_event.h:1234 [inline] prepare_task_switch kernel/sched/core.c:4793 [inline] context_switch kernel/sched/core.c:4935 [inline] __schedule+0xead/0x2160 kernel/sched/core.c:6293 schedule+0xd2/0x260 kernel/sched/core.c:6366 exit_to_user_mode_loop kernel/entry/common.c:163 [inline] exit_to_user_mode_prepare+0x114/0x1c0 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:300 do_syscall_64+0x48/0x90 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #2 (&rq->__lock){-.-.}-{2:2}: _raw_spin_lock_nested+0x30/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:489 raw_spin_rq_lock kernel/sched/sched.h:1318 [inline] rq_lock kernel/sched/sched.h:1616 [inline] task_fork_fair+0x63/0x4d0 kernel/sched/fair.c:11193 sched_post_fork+0x343/0x490 kernel/sched/core.c:4459 copy_process+0x531e/0x6be0 kernel/fork.c:2382 kernel_clone+0xe7/0xa60 kernel/fork.c:2558 kernel_thread+0xb5/0xf0 kernel/fork.c:2610 rest_init+0x24/0x3d0 init/main.c:692 start_kernel+0x484/0x4a5 init/main.c:1141 secondary_startup_64_no_verify+0xc2/0xcb -> #1 (&p->pi_lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 try_to_wake_up+0xac/0x14c0 kernel/sched/core.c:4014 up+0x75/0xb0 kernel/locking/semaphore.c:190 __up_console_sem+0x6e/0x80 kernel/printk/printk.c:255 console_unlock+0x53e/0xae0 kernel/printk/printk.c:2731 vprintk_emit+0x198/0x450 kernel/printk/printk.c:2249 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50 _printk+0xba/0xed kernel/printk/printk.c:2270 kauditd_printk_skb kernel/audit.c:538 [inline] kauditd_hold_skb.cold+0x41/0x50 kernel/audit.c:571 kauditd_send_queue+0x1ab/0x220 kernel/audit.c:734 kauditd_thread+0x762/0xba0 kernel/audit.c:860 kthread+0x40c/0x500 kernel/kthread.c:345 ret_from_fork+0x22/0x30 arch/x86/entry/entry_64.S:295 -> #0 ((console_sem).lock){-.-.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3063 [inline] check_prevs_add kernel/locking/lockdep.c:3186 [inline] validate_chain kernel/locking/lockdep.c:3801 [inline] __lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027 lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5602 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 down_trylock+0xe/0x60 kernel/locking/semaphore.c:138 __down_trylock_console_sem+0x3b/0xd0 kernel/printk/printk.c:238 console_trylock kernel/printk/printk.c:2546 [inline] console_trylock_spinning kernel/printk/printk.c:1847 [inline] vprintk_emit+0x146/0x450 kernel/printk/printk.c:2248 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50 _printk+0xba/0xed kernel/printk/printk.c:2270 show_trace_log_lvl+0x57/0x2bb arch/x86/kernel/dumpstack.c:195 ex_handler_wrmsr_unsafe arch/x86/mm/extable.c:87 [inline] fixup_exception+0x3f7/0x700 arch/x86/mm/extable.c:150 __exc_general_protection arch/x86/kernel/traps.c:601 [inline] exc_general_protection+0xed/0x2f0 arch/x86/kernel/traps.c:562 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:562 __wrmsr arch/x86/include/asm/msr.h:103 [inline] native_write_msr arch/x86/include/asm/msr.h:160 [inline] wrmsrl arch/x86/include/asm/msr.h:281 [inline] __x86_pmu_enable_event arch/x86/events/perf_event.h:1122 [inline] x86_pmu_enable_all+0x132/0x3c0 arch/x86/events/core.c:743 x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350 perf_pmu_enable kernel/events/core.c:1207 [inline] perf_pmu_enable kernel/events/core.c:1203 [inline] ctx_resched+0x2b0/0x390 kernel/events/core.c:2750 __perf_install_in_context+0x285/0x310 kernel/events/core.c:2817 remote_function kernel/events/core.c:91 [inline] remote_function+0x125/0x1b0 kernel/events/core.c:71 generic_exec_single+0x203/0x300 kernel/smp.c:518 smp_call_function_single+0x189/0x460 kernel/smp.c:755 task_function_call+0xe5/0x170 kernel/events/core.c:119 perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2918 __do_sys_perf_event_open+0x1bf0/0x3040 kernel/events/core.c:12429 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae 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 *** 4 locks held by syz-executor.7/14301: #0: ffff888016e31360 (&sig->exec_update_lock){++++}-{3:3}, at: __do_sys_perf_event_open+0x1023/0x3040 kernel/events/core.c:12269 #1: ffff8880403708b0 (&ctx->mutex){+.+.}-{3:3}, at: __do_sys_perf_event_open+0x17cd/0x3040 kernel/events/core.c:12323 #2: ffff88806ce3ef20 (&cpuctx_lock){-.-.}-{2:2}, at: __perf_install_in_context+0xf4/0x310 kernel/events/core.c:2778 #3: ffff888040370820 (&ctx->lock){-.-.}-{2:2}, at: __perf_install_in_context+0x12d/0x310 kernel/events/core.c:2780 stack backtrace: CPU: 0 PID: 14301 Comm: syz-executor.7 Not tainted 5.16.0-rc4-next-20211206 #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 lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2143 check_prev_add kernel/locking/lockdep.c:3063 [inline] check_prevs_add kernel/locking/lockdep.c:3186 [inline] validate_chain kernel/locking/lockdep.c:3801 [inline] __lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027 lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5602 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 down_trylock+0xe/0x60 kernel/locking/semaphore.c:138 __down_trylock_console_sem+0x3b/0xd0 kernel/printk/printk.c:238 console_trylock kernel/printk/printk.c:2546 [inline] console_trylock_spinning kernel/printk/printk.c:1847 [inline] vprintk_emit+0x146/0x450 kernel/printk/printk.c:2248 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50 _printk+0xba/0xed kernel/printk/printk.c:2270 show_trace_log_lvl+0x57/0x2bb arch/x86/kernel/dumpstack.c:195 ex_handler_wrmsr_unsafe arch/x86/mm/extable.c:87 [inline] fixup_exception+0x3f7/0x700 arch/x86/mm/extable.c:150 __exc_general_protection arch/x86/kernel/traps.c:601 [inline] exc_general_protection+0xed/0x2f0 arch/x86/kernel/traps.c:562 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:562 RIP: 0010:__wrmsr arch/x86/include/asm/msr.h:103 [inline] RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:160 [inline] RIP: 0010:wrmsrl arch/x86/include/asm/msr.h:281 [inline] RIP: 0010:__x86_pmu_enable_event arch/x86/events/perf_event.h:1122 [inline] RIP: 0010:x86_pmu_enable_all+0x132/0x3c0 arch/x86/events/core.c:743 Code: f7 d7 49 21 c7 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 64 02 00 00 48 8b 9b 78 01 00 00 4c 89 fa 44 89 f8 48 c1 ea 20 89 d9 <0f> 30 0f 1f 44 00 00 e8 92 39 42 00 e8 8d 39 42 00 8b 1d 83 da 8a RSP: 0018:ffff88801dabf968 EFLAGS: 00010016 RAX: 0000000000530076 RBX: 00000000c0010200 RCX: 00000000c0010200 RDX: 0000000000000100 RSI: ffffffff8100df36 RDI: ffff88803e4e57b8 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8100df25 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88806ce217e0 R14: ffff88806ce219e0 R15: 0000010000530076 x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350 perf_pmu_enable kernel/events/core.c:1207 [inline] perf_pmu_enable kernel/events/core.c:1203 [inline] ctx_resched+0x2b0/0x390 kernel/events/core.c:2750 __perf_install_in_context+0x285/0x310 kernel/events/core.c:2817 remote_function kernel/events/core.c:91 [inline] remote_function+0x125/0x1b0 kernel/events/core.c:71 generic_exec_single+0x203/0x300 kernel/smp.c:518 smp_call_function_single+0x189/0x460 kernel/smp.c:755 task_function_call+0xe5/0x170 kernel/events/core.c:119 perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2918 __do_sys_perf_event_open+0x1bf0/0x3040 kernel/events/core.c:12429 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0eede44b19 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:00007f0eeb3ba188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f0eedf57f60 RCX: 00007f0eede44b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00007f0eede9ef6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbbc9a2df R14: 00007f0eeb3ba300 R15: 0000000000022000 x86_pmu_enable+0x580/0xd90 arch/x86/events/core.c:1350 perf_pmu_enable kernel/events/core.c:1207 [inline] perf_pmu_enable kernel/events/core.c:1203 [inline] ctx_resched+0x2b0/0x390 kernel/events/core.c:2750 __perf_install_in_context+0x285/0x310 kernel/events/core.c:2817 remote_function kernel/events/core.c:91 [inline] remote_function+0x125/0x1b0 kernel/events/core.c:71 generic_exec_single+0x203/0x300 kernel/smp.c:518 smp_call_function_single+0x189/0x460 kernel/smp.c:755 task_function_call+0xe5/0x170 kernel/events/core.c:119 perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2918 __do_sys_perf_event_open+0x1bf0/0x3040 kernel/events/core.c:12429 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0eede44b19 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:00007f0eeb3ba188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f0eedf57f60 RCX: 00007f0eede44b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00007f0eede9ef6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbbc9a2df R14: 00007f0eeb3ba300 R15: 0000000000022000 Call Trace: x86_pmu_stop+0x149/0x360 arch/x86/events/core.c:1597 x86_pmu_del+0x1be/0x610 arch/x86/events/core.c:1636 event_sched_out+0x2ed/0xaf0 kernel/events/core.c:2285 __perf_remove_from_context+0x7f/0x810 kernel/events/core.c:2352 event_function+0x28e/0x3c0 kernel/events/core.c:253 remote_function kernel/events/core.c:91 [inline] remote_function+0x125/0x1b0 kernel/events/core.c:71 flush_smp_call_function_queue+0x1df/0x610 kernel/smp.c:628 __sysvec_call_function_single+0x92/0x3a0 arch/x86/kernel/smp.c:248 sysvec_call_function_single+0x3b/0xc0 arch/x86/kernel/smp.c:243 asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:646 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 1e 03 21 fd 48 89 ef e8 96 7e 21 fd e8 91 09 42 fd fb bf 01 00 00 00 c6 3e 17 fd 65 8b 05 7f 92 fa 7b 85 c0 74 02 5d c3 0f 1f 44 00 RSP: 0018:ffff88806ce09dd8 EFLAGS: 00000246 RAX: 0000000000000007 RBX: fffffffffffffc57 RCX: 1ffffffff0b17d79 RDX: 0000000000000000 RSI: ffffffff8149e691 RDI: 0000000000000001 RBP: ffff88806ce281c0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8149e678 R11: 0000000000000001 R12: ffffed100d9c13cf R13: dffffc0000000000 R14: ffffffff811bdb00 R15: ffff88806ce281c0 __run_timers.part.0+0x387/0xa00 kernel/time/timer.c:1736 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1747 __do_softirq+0x270/0x8c7 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x113/0x170 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:arch_local_irq_enable arch/x86/include/asm/irqflags.h:81 [inline] RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:138 [inline] RIP: 0010:generic_exec_single+0x20c/0x300 kernel/smp.c:520 Code: 31 e4 4c 89 ef 0f ae e8 ff d5 e9 ec fe ff ff e8 1a be 0a 00 e8 15 88 11 00 4c 89 ef 0f ae e8 ff d5 e8 18 8b 11 00 fb 45 31 e4 cc fe ff ff e8 fa bd 0a 00 0f 0b e9 73 ff ff ff 4c 89 f7 e8 0b RSP: 0018:ffff88801dabfb08 EFLAGS: 00000246 RAX: 0000000000000007 RBX: 0000000000000200 RCX: 1ffffffff0b17d79 RDX: 0000000000000000 RSI: ffffffff8149e691 RDI: ffffffff81385b28 RBP: ffffffff815136f0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8149e678 R11: 0000000000000001 R12: 0000000000000000 R13: ffff88801dabfc38 R14: ffff88801dabfb88 R15: 0000000000000200 smp_call_function_single+0x189/0x460 kernel/smp.c:755 task_function_call+0xe5/0x170 kernel/events/core.c:119 perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2918 __do_sys_perf_event_open+0x1bf0/0x3040 kernel/events/core.c:12429 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f0eede44b19 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:00007f0eeb3ba188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f0eedf57f60 RCX: 00007f0eede44b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00007f0eede9ef6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbbc9a2df R14: 00007f0eeb3ba300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: f7 d7 not %edi 2: 49 21 c7 and %rax,%r15 5: 48 89 f8 mov %rdi,%rax 8: 48 c1 e8 03 shr $0x3,%rax c: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 11: 0f 85 64 02 00 00 jne 0x27b 17: 48 8b 9b 78 01 00 00 mov 0x178(%rbx),%rbx 1e: 4c 89 fa mov %r15,%rdx 21: 44 89 f8 mov %r15d,%eax 24: 48 c1 ea 20 shr $0x20,%rdx 28: 89 d9 mov %ebx,%ecx * 2a: 0f 30 wrmsr <-- trapping instruction 2c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 31: e8 92 39 42 00 callq 0x4239c8 36: e8 8d 39 42 00 callq 0x4239c8 3b: 8b .byte 0x8b 3c: 1d .byte 0x1d 3d: 83 da 8a sbb $0xffffff8a,%edx