Call Trace: ====================================================== WARNING: possible circular locking dependency detected 5.17.0-rc8-next-20220317 #1 Not tainted ------------------------------------------------------ syz-executor.6/465712 is trying to acquire lock: ffffffff851f5558 ((console_sem).lock){-.-.}-{2:2} mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium , at: down_trylock+0xe/0x60 but task is already holding lock: ffff888038bf5420 (&ctx->lock){....}-{2:2}, at: __perf_install_in_context+0x12d/0x310 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+0x519/0x1950 __schedule+0xebf/0x21a0 schedule+0xd2/0x1f0 futex_wait_queue+0x144/0x3b0 futex_wait+0x2c9/0x660 do_futex+0x2fb/0x380 __x64_sys_futex+0x1c6/0x4c0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #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+0x343/0x490 copy_process+0x4272/0x6d10 kernel_clone+0xe7/0xa60 kernel_thread+0xb5/0xf0 rest_init+0x24/0x3d0 start_kernel+0x489/0x4aa secondary_startup_64_no_verify+0xd5/0xdb -> #1 (&p->pi_lock){-.-.}-{2:2}: _raw_spin_lock_irqsave+0x39/0x50 try_to_wake_up+0xa5/0x1060 up+0x75/0xb0 __up_console_sem+0x6e/0x80 console_unlock+0x603/0xd40 do_con_write+0xc01/0x1d40 con_write+0x21/0x40 n_tty_write+0x416/0xfe0 file_tty_write.constprop.0+0x529/0x910 new_sync_write+0x437/0x660 vfs_write+0x7c2/0xad0 ksys_write+0x12d/0x250 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #0 ((console_sem).lock){-.-.}-{2:2}: __lock_acquire+0x2c2f/0x6120 lock_acquire+0x1a2/0x4d0 _raw_spin_lock_irqsave+0x39/0x50 down_trylock+0xe/0x60 __down_trylock_console_sem+0x3b/0xd0 vprintk_emit+0x162/0x550 vprintk+0x80/0x90 _printk+0xba/0xed show_trace_log_lvl+0x57/0x2bb ex_handler_msr+0x311/0x3a0 fixup_exception+0x307/0xff0 exc_general_protection+0xf6/0x2d0 asm_exc_general_protection+0x1e/0x30 x86_pmu_enable_all+0x2f7/0x3c0 x86_pmu_enable+0x580/0xd90 ctx_resched+0x2b0/0x390 __perf_install_in_context+0x285/0x310 remote_function+0x125/0x1b0 generic_exec_single+0x203/0x300 smp_call_function_single+0x189/0x460 task_function_call+0xe5/0x170 perf_install_in_context+0x2cb/0x550 __do_sys_perf_event_open+0x1bf0/0x3040 do_syscall_64+0x3b/0x90 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.6/465712: #0: ffff888022550ca0 (&sig->exec_update_lock){++++}-{3:3}, at: __do_sys_perf_event_open+0x1023/0x3040 #1: ffff888038bf54b0 (&ctx->mutex){+.+.}-{3:3}, at: __do_sys_perf_event_open+0x17cd/0x3040 #2: ffff88806ce3f220 (&cpuctx_lock){-.-.}-{2:2}, at: __perf_install_in_context+0xf4/0x310 #3: ffff888038bf5420 (&ctx->lock){....}-{2:2}, at: __perf_install_in_context+0x12d/0x310 stack backtrace: CPU: 0 PID: 465712 Comm: syz-executor.6 Not tainted 5.17.0-rc8-next-20220317 #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+0x25f/0x2e0 __lock_acquire+0x2c2f/0x6120 lock_acquire+0x1a2/0x4d0 _raw_spin_lock_irqsave+0x39/0x50 down_trylock+0xe/0x60 __down_trylock_console_sem+0x3b/0xd0 vprintk_emit+0x162/0x550 vprintk+0x80/0x90 _printk+0xba/0xed show_trace_log_lvl+0x57/0x2bb ex_handler_msr+0x311/0x3a0 fixup_exception+0x307/0xff0 exc_general_protection+0xf6/0x2d0 asm_exc_general_protection+0x1e/0x30 RIP: 0010:x86_pmu_enable_all+0x2f7/0x3c0 Code: 00 8b 7c 24 1c 48 8b 44 24 10 e8 64 58 3f 03 89 44 24 10 e8 fb 71 42 00 4c 89 fa 8b 4c 24 08 4c 89 f8 03 4c 24 10 48 c1 ea 20 <0f> 30 66 90 e8 e0 71 42 00 e9 cc fd ff ff 48 83 c4 20 5b 5d 41 5c RSP: 0018:ffff888018327968 EFLAGS: 00010016 RAX: 0000000f004000ff RBX: ffff8880199e0b70 RCX: 00000000c0010202 RDX: 000000000000000f RSI: ffffffff8100df45 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff810155ed R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88806ce21c20 R14: ffff88806ce21e20 R15: 0000000f004000ff x86_pmu_enable+0x580/0xd90 ctx_resched+0x2b0/0x390 __perf_install_in_context+0x285/0x310 remote_function+0x125/0x1b0 generic_exec_single+0x203/0x300 smp_call_function_single+0x189/0x460 task_function_call+0xe5/0x170 perf_install_in_context+0x2cb/0x550 __do_sys_perf_event_open+0x1bf0/0x3040 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3a56fd1b19 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:00007f3a54547188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f3a570e4f60 RCX: 00007f3a56fd1b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00007f3a5702bf6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc9a0c865f R14: 00007f3a54547300 R15: 0000000000022000 x86_pmu_enable+0x580/0xd90 ctx_resched+0x2b0/0x390 __perf_install_in_context+0x285/0x310 remote_function+0x125/0x1b0 generic_exec_single+0x203/0x300 smp_call_function_single+0x189/0x460 task_function_call+0xe5/0x170 perf_install_in_context+0x2cb/0x550 __do_sys_perf_event_open+0x1bf0/0x3040 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f3a56fd1b19 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:00007f3a54547188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f3a570e4f60 RCX: 00007f3a56fd1b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00007f3a5702bf6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc9a0c865f R14: 00007f3a54547300 R15: 0000000000022000 Call Trace: x86_pmu_enable+0x580/0xd90 ctx_resched+0x2b0/0x390 __perf_install_in_context+0x285/0x310 remote_function+0x125/0x1b0 generic_exec_single+0x203/0x300 smp_call_function_single+0x189/0x460 perf_install_in_context+0x4a3/0x550 __do_sys_perf_event_open+0x1bf0/0x3040 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6e0429eb19 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:00007f6e01814188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium RAX: ffffffffffffffda RBX: 00007f6e043b1f60 RCX: 00007f6e0429eb19 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000000 RBP: 00007f6e042f8f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff46904c8f R14: 00007f6e01814300 R15: 0000000000022000 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium Call Trace: x86_pmu_enable+0x580/0xd90 ctx_resched+0x2b0/0x390 __perf_install_in_context+0x285/0x310 remote_function+0x125/0x1b0 generic_exec_single+0x203/0x300 smp_call_function_single+0x189/0x460 perf_install_in_context+0x4a3/0x550 __do_sys_perf_event_open+0x1bf0/0x3040 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6e0429eb19 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:00007f6e01814188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f6e043b1f60 RCX: 00007f6e0429eb19 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000000 RBP: 00007f6e042f8f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff46904c8f R14: 00007f6e01814300 R15: 0000000000022000 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium Call Trace: x86_pmu_enable+0x580/0xd90 ctx_resched+0x2b0/0x390 __perf_install_in_context+0x285/0x310 remote_function+0x125/0x1b0 generic_exec_single+0x203/0x300 smp_call_function_single+0x189/0x460 perf_install_in_context+0x4a3/0x550 __do_sys_perf_event_open+0x1bf0/0x3040 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6e0429eb19 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:00007f6e01814188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f6e043b1f60 RCX: 00007f6e0429eb19 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000020000000 RBP: 00007f6e042f8f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff46904c8f R14: 00007f6e01814300 R15: 0000000000022000 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 12 bytes leftover after parsing attributes in process `syz-executor.6'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.6'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 12 bytes leftover after parsing attributes in process `syz-executor.6'. program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 12 bytes leftover after parsing attributes in process `syz-executor.6'. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium netlink: 'syz-executor.0': attribute type 19 has an invalid length. mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium ---------------- Code disassembly (best guess): 0: 00 8b 7c 24 1c 48 add %cl,0x481c247c(%rbx) 6: 8b 44 24 10 mov 0x10(%rsp),%eax a: e8 64 58 3f 03 callq 0x33f5873 f: 89 44 24 10 mov %eax,0x10(%rsp) 13: e8 fb 71 42 00 callq 0x427213 18: 4c 89 fa mov %r15,%rdx 1b: 8b 4c 24 08 mov 0x8(%rsp),%ecx 1f: 4c 89 f8 mov %r15,%rax 22: 03 4c 24 10 add 0x10(%rsp),%ecx 26: 48 c1 ea 20 shr $0x20,%rdx * 2a: 0f 30 wrmsr <-- trapping instruction 2c: 66 90 xchg %ax,%ax 2e: e8 e0 71 42 00 callq 0x427213 33: e9 cc fd ff ff jmpq 0xfffffe04 38: 48 83 c4 20 add $0x20,%rsp 3c: 5b pop %rbx 3d: 5d pop %rbp 3e: 41 5c pop %r12