audit: type=1400 audit(1663938741.970:8): avc: denied { kernel } for pid=3718 comm="syz-executor.7" 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-20220923 #1 Not tainted ------------------------------------------------------ syz-executor.7/3721 is trying to acquire lock: ffffffff853faaf8 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70 but task is already holding lock: ffff88800f55d020 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0 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 do_con_write+0xc05/0x1d50 con_write+0x21/0x40 n_tty_write+0x4d4/0xfe0 file_tty_write.constprop.0+0x49c/0x8f0 vfs_write+0x9c3/0xd90 ksys_write+0x127/0x250 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 group_sched_out.part.0+0x2c7/0x460 ctx_sched_out+0x8f1/0xc10 __perf_event_task_sched_out+0x6d0/0x18d0 __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 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.7/3721: #0: ffff88806ce37d18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470 #1: ffff88800f55d020 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0 stack backtrace: CPU: 0 PID: 3721 Comm: syz-executor.7 Not tainted 6.0.0-rc6-next-20220923 #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:group_sched_out.part.0+0x2c7/0x460 Code: 5e 41 5f e9 5b bb ef ff e8 56 bb ef ff 65 8b 1d 1b 26 ac 7e 31 ff 89 de e8 f6 b7 ef ff 85 db 0f 84 8a 00 00 00 e8 39 bb ef ff <0f> 0b e9 a5 fe ff ff e8 2d bb ef ff 48 8d 7d 10 48 b8 00 00 00 00 RSP: 0018:ffff88801de5f8f8 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801d168000 RSI: ffffffff81564fb7 RDI: 0000000000000005 RBP: ffff8880086685c8 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865b001b R12: ffff88800f55d000 R13: ffff88806ce3d140 R14: ffffffff8547d040 R15: 0000000000000002 ctx_sched_out+0x8f1/0xc10 __perf_event_task_sched_out+0x6d0/0x18d0 __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 RIP: 0033:0x7f7ebff54b19 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:00007f7ebd4ca218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f7ec0067f68 RCX: 00007f7ebff54b19 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7ec0067f68 RBP: 00007f7ec0067f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7ec0067f6c R13: 00007fff9be763cf R14: 00007f7ebd4ca300 R15: 0000000000022000 WARNING: CPU: 0 PID: 3721 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460 Modules linked in: CPU: 0 PID: 3721 Comm: syz-executor.7 Not tainted 6.0.0-rc6-next-20220923 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:group_sched_out.part.0+0x2c7/0x460 Code: 5e 41 5f e9 5b bb ef ff e8 56 bb ef ff 65 8b 1d 1b 26 ac 7e 31 ff 89 de e8 f6 b7 ef ff 85 db 0f 84 8a 00 00 00 e8 39 bb ef ff <0f> 0b e9 a5 fe ff ff e8 2d bb ef ff 48 8d 7d 10 48 b8 00 00 00 00 RSP: 0018:ffff88801de5f8f8 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801d168000 RSI: ffffffff81564fb7 RDI: 0000000000000005 RBP: ffff8880086685c8 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff865b001b R12: ffff88800f55d000 R13: ffff88806ce3d140 R14: ffffffff8547d040 R15: 0000000000000002 FS: 00007f7ebd4ca700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1f5b17a8e0 CR3: 000000004029a000 CR4: 0000000000350ef0 Call Trace: ctx_sched_out+0x8f1/0xc10 __perf_event_task_sched_out+0x6d0/0x18d0 __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 RIP: 0033:0x7f7ebff54b19 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:00007f7ebd4ca218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f7ec0067f68 RCX: 00007f7ebff54b19 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7ec0067f68 RBP: 00007f7ec0067f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7ec0067f6c R13: 00007fff9be763cf R14: 00007f7ebd4ca300 R15: 0000000000022000 irq event stamp: 750 hardirqs last enabled at (749): [] syscall_enter_from_user_mode+0x1d/0x50 hardirqs last disabled at (750): [] __schedule+0x1225/0x2470 softirqs last enabled at (480): [] __irq_exit_rcu+0x11b/0x180 softirqs last disabled at (379): [] __irq_exit_rcu+0x11b/0x180 ---[ end trace 0000000000000000 ]--- random: crng reseeded on system resumption Restarting kernel threads ... done. random: crng reseeded on system resumption BUG: unable to handle page fault for address: ffffebde00000848 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 PID: 3966 Comm: syz-executor.1 Tainted: G W 6.0.0-rc6-next-20220923 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:kfree+0x5d/0x190 Code: 80 48 01 e8 0f 82 39 01 00 00 48 c7 c2 00 00 00 80 48 2b 15 05 3f b0 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 e3 3e b0 03 <48> 8b 50 08 48 89 c7 f6 c2 01 0f 85 f7 00 00 00 66 90 48 8b 07 f6 RSP: 0018:ffff8880409a7be8 EFLAGS: 00010282 RAX: ffffebde00000840 RBX: ffff88800d0f78c0 RCX: ffffc900025e2000 RDX: 0000777f80000000 RSI: ffffffff8204e598 RDI: 0000000000021000 RBP: 0000000000021000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000200000 R11: 0000000000000001 R12: ffff88800d0f7904 R13: ffff88800d0f7910 R14: 00000000ffffffa6 R15: ffff88800a11f880 FS: 00007f16123d2700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffebde00000848 CR3: 000000000dd62000 CR4: 0000000000350ef0 Call Trace: io_sendrecv_fail+0x2a8/0x3e0 io_req_complete_failed+0x167/0x1d0 io_queue_sqe_fallback+0x155/0x190 io_submit_sqes+0x17a3/0x1c40 __do_sys_io_uring_enter+0xac3/0x22b0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f1614e7db19 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:00007f16123d2188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f1614f91020 RCX: 00007f1614e7db19 RDX: 0000000000000000 RSI: 0000000000100001 RDI: 0000000000000003 RBP: 00007f1614ed7f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe39e688af R14: 00007f16123d2300 R15: 0000000000022000 Modules linked in: CR2: ffffebde00000848 ---[ end trace 0000000000000000 ]--- RIP: 0010:kfree+0x5d/0x190 Code: 80 48 01 e8 0f 82 39 01 00 00 48 c7 c2 00 00 00 80 48 2b 15 05 3f b0 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 03 05 e3 3e b0 03 <48> 8b 50 08 48 89 c7 f6 c2 01 0f 85 f7 00 00 00 66 90 48 8b 07 f6 RSP: 0018:ffff8880409a7be8 EFLAGS: 00010282 RAX: ffffebde00000840 RBX: ffff88800d0f78c0 RCX: ffffc900025e2000 RDX: 0000777f80000000 RSI: ffffffff8204e598 RDI: 0000000000021000 RBP: 0000000000021000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000200000 R11: 0000000000000001 R12: ffff88800d0f7904 R13: ffff88800d0f7910 R14: 00000000ffffffa6 R15: ffff88800a11f880 FS: 00007f16123d2700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffebde00000848 CR3: 000000000dd62000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 80 48 01 e8 orb $0xe8,0x1(%rax) 4: 0f 82 39 01 00 00 jb 0x143 a: 48 c7 c2 00 00 00 80 mov $0xffffffff80000000,%rdx 11: 48 2b 15 05 3f b0 03 sub 0x3b03f05(%rip),%rdx # 0x3b03f1d 18: 48 01 d0 add %rdx,%rax 1b: 48 c1 e8 0c shr $0xc,%rax 1f: 48 c1 e0 06 shl $0x6,%rax 23: 48 03 05 e3 3e b0 03 add 0x3b03ee3(%rip),%rax # 0x3b03f0d * 2a: 48 8b 50 08 mov 0x8(%rax),%rdx <-- trapping instruction 2e: 48 89 c7 mov %rax,%rdi 31: f6 c2 01 test $0x1,%dl 34: 0f 85 f7 00 00 00 jne 0x131 3a: 66 90 xchg %ax,%ax 3c: 48 8b 07 mov (%rdi),%rax 3f: f6 .byte 0xf6