blktrace: Concurrent blktraces are not allowed on loop6 watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.2:9726] Modules linked in: irq event stamp: 82710896 hardirqs last enabled at (82710895): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (82710895): [] _raw_spin_unlock_irqrestore+0x34/0x40 kernel/locking/spinlock.c:191 hardirqs last disabled at (82710896): [] sysvec_apic_timer_interrupt+0xb/0xa0 arch/x86/kernel/apic/apic.c:1095 softirqs last enabled at (238444): [] asm_call_irq_on_stack+0x12/0x20 softirqs last disabled at (238403): [] asm_call_irq_on_stack+0x12/0x20 CPU: 1 PID: 9726 Comm: syz-executor.2 Not tainted 5.10.109 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:__sanitizer_cov_trace_cmp4+0x4/0x20 kernel/kcov.c:258 Code: 00 00 00 00 66 90 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 4c ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 48 8b 0c 24 <89> f2 89 fe bf 04 00 00 00 e9 2e ff ff ff 66 66 2e 0f 1f 84 00 00 RSP: 0018:ffff88804ac87d98 EFLAGS: 00000246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8186d106 RDX: 0000000000040000 RSI: 0000000000010000 RDI: 0000000000000000 RBP: ffff88800d50e280 R08: 0000000000000000 R09: ffff88804ae29947 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888045fae000 R14: ffff888045fae450 R15: ffff888045fae000 FS: 00007f4fe4219700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d623000 CR3: 00000000334fc000 CR4: 0000000000350ee0 Call Trace: io_should_wake fs/io_uring.c:6985 [inline] io_cqring_wait fs/io_uring.c:7074 [inline] __do_sys_io_uring_enter+0x8e6/0x1900 fs/io_uring.c:9145 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f4fe6ca3b19 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:00007f4fe4219188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f4fe6db6f60 RCX: 00007f4fe6ca3b19 RDX: 00000000fffffffb RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f4fe6cfdf6d R08: 0000000000000000 R09: 0000000000000039 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff732af13f R14: 00007f4fe4219300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9741 Comm: syz-executor.2 Not tainted 5.10.109 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1159 [inline] RIP: 0010:rcu_lockdep_current_cpu_online+0x57/0xd0 kernel/rcu/tree.c:1149 Code: 7e 53 48 c7 c3 40 bf 03 00 65 48 03 1d 1a b3 d4 7e 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 53 48 8d 7b 20 48 8b 6b 18 48 b8 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffff88804a337c30 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff88806ce3bf40 RCX: ffffffff8126af3f RDX: 1ffff1100d9c77eb RSI: 0000000000000008 RDI: ffff88806ce3bf58 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8547408f R10: fffffbfff0a8e811 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000000 R14: ffff888046674468 R15: 0000000000000000 FS: 00007f4fe41f8700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000000334fc000 CR4: 0000000000350ef0 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:110 [inline] rcu_read_lock_held_common kernel/rcu/update.c:100 [inline] rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:121 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x3f9/0x490 kernel/locking/lockdep.c:5533 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x36/0x50 kernel/locking/spinlock.c:159 finish_wait+0xb2/0x210 kernel/sched/wait.c:392 io_cqring_wait fs/io_uring.c:7077 [inline] __do_sys_io_uring_enter+0xded/0x1900 fs/io_uring.c:9145 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f4fe6ca3b19 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:00007f4fe41f8188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f4fe6db7020 RCX: 00007f4fe6ca3b19 RDX: 00000000fffffffb RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f4fe6cfdf6d R08: 0000000000000000 R09: 0000000000000039 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff732af13f R14: 00007f4fe41f8300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 00 add %al,(%rax) 4: 66 90 xchg %ax,%ax 6: 48 8b 0c 24 mov (%rsp),%rcx a: 0f b7 d6 movzwl %si,%edx d: 0f b7 f7 movzwl %di,%esi 10: bf 02 00 00 00 mov $0x2,%edi 15: e9 4c ff ff ff jmpq 0xffffff66 1a: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 21: 00 00 00 00 25: 90 nop 26: 48 8b 0c 24 mov (%rsp),%rcx * 2a: 89 f2 mov %esi,%edx <-- trapping instruction 2c: 89 fe mov %edi,%esi 2e: bf 04 00 00 00 mov $0x4,%edi 33: e9 2e ff ff ff jmpq 0xffffff66 38: 66 data16 39: 66 data16 3a: 2e cs 3b: 0f .byte 0xf 3c: 1f (bad) 3d: 84 00 test %al,(%rax)