watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.1.496:7510] Modules linked in: irq event stamp: 11655686 hardirqs last enabled at (11655685): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (11655686): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (11653906): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (11653906): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (11653906): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (11653811): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (11653811): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (11653811): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 7510 Comm: syz.1.496 Not tainted 6.15.0-syzkaller-gd69bafe6ee2b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:124 [inline] RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:431 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x6b0/0xb60 kernel/locking/qspinlock.c:325 Code: c0 0f 85 42 01 00 00 c6 07 00 43 0f b6 04 37 84 c0 0f 85 60 01 00 00 c6 01 01 41 be 00 80 ff ff 66 c7 84 24 90 00 00 00 00 01 <48> b8 00 00 00 00 00 fc ff df 48 8b 4c 24 20 0f b6 04 01 84 c0 75 RSP: 0018:ffffc90004e5f820 EFLAGS: 00000282 RAX: 0000000000000000 RBX: ffff888148c837d8 RCX: 1ffff110291906fb RDX: ffffc90004f99000 RSI: 000000000007ffff RDI: ffff8880b873c894 RBP: ffffc90004e5f938 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: 1ffffffff1bf5318 R13: 0000000000000000 R14: 00000000fffff3ea R15: 1ffff110291906fb FS: 00007f6eecb666c0(0000) GS:ffff888125d54000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30910ff8 CR3: 0000000079e88000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:557 [inline] queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x21f/0x290 kernel/locking/spinlock_debug.c:116 spin_lock include/linux/spinlock.h:351 [inline] d_instantiate+0x64/0xa0 fs/dcache.c:1946 alloc_path_pseudo fs/file_table.c:364 [inline] alloc_file_pseudo+0xf6/0x210 fs/file_table.c:376 __anon_inode_getfile fs/anon_inodes.c:153 [inline] __anon_inode_getfd fs/anon_inodes.c:278 [inline] anon_inode_getfd+0xca/0x1b0 fs/anon_inodes.c:313 bpf_prog_load+0x1465/0x1930 kernel/bpf/syscall.c:3002 __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5978 __do_sys_bpf kernel/bpf/syscall.c:6085 [inline] __se_sys_bpf kernel/bpf/syscall.c:6083 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6083 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6eebd8e929 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6eecb66038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6eebfb5fa0 RCX: 00007f6eebd8e929 RDX: 0000000000000048 RSI: 0000200000000200 RDI: 0000000000000005 RBP: 00007f6eebe10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6eebfb5fa0 R15: 00007ffdc7d39498 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7504 Comm: syz.3.494 Not tainted 6.15.0-syzkaller-gd69bafe6ee2b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x2f/0x90 kernel/kcov.c:321 Code: 8b 04 24 65 48 8b 0c 25 08 c0 9c 92 65 8b 15 e8 59 dc 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 3c 16 00 00 00 <74> 4e 8b 91 18 16 00 00 83 fa 03 75 43 48 8b 91 20 16 00 00 44 8b RSP: 0018:ffffc90000007c08 EFLAGS: 00000046 RAX: ffffffff81f0a79f RBX: 0000000000000100 RCX: ffff88802a5e1e00 RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000 RBP: ffffc90000007d01 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: ffffffff8e1a0700 R13: dffffc0000000000 R14: ffff88802a5e1e00 R15: dffffc0000000000 FS: 000055558b7a8500(0000) GS:ffff888125c54000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000bb000 CR3: 0000000079dcc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: interrupt_context_level include/linux/preempt.h:97 [inline] get_recursion_context kernel/events/internal.h:215 [inline] perf_swevent_get_recursion_context+0x6f/0x100 kernel/events/core.c:10552 perf_trace_buf_alloc+0x59/0x2a0 kernel/trace/trace_event_perf.c:410 do_perf_trace_preemptirq_template include/trace/events/preemptirq.h:14 [inline] perf_trace_preemptirq_template+0x149/0x340 include/trace/events/preemptirq.h:14 __do_trace_irq_enable include/trace/events/preemptirq.h:40 [inline] trace_irq_enable+0xee/0x110 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:73 irqentry_exit+0x74/0x90 kernel/entry/common.c:310 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:318 [inline] RIP: 0010:handle_softirqs+0x1b0/0x870 kernel/softirq.c:567 Code: 89 64 24 30 0f b7 db 48 c7 c7 40 a4 89 8b e8 d7 7a e0 09 65 66 c7 05 c5 17 17 11 00 00 e8 f8 44 42 00 fb 49 c7 c7 c0 c0 e0 8d ff ff ff ff 0f bc c3 41 89 c5 41 ff c5 0f 84 c2 03 00 00 89 5c RSP: 0018:ffffc90000007e40 EFLAGS: 00000286 RAX: 703e80c3bd4c1000 RBX: 0000000000000200 RCX: 703e80c3bd4c1000 RDX: 0000000000000002 RSI: ffffffff8d97cf77 RDI: ffffffff8be28800 RBP: ffffc90000007f50 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: 000000000000000a R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffff8de0c0c0 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:rcu_read_unlock_special+0x87/0x4c0 kernel/rcu/tree_plugin.h:694 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 c2 e2 f4 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90004f6fc20 EFLAGS: 00000206 RAX: 703e80c3bd4c1000 RBX: 1ffff920009edf8c RCX: 703e80c3bd4c1000 RDX: 0000000000000006 RSI: ffffffff8d97cf77 RDI: ffffffff8be28800 RBP: ffffc90004f6fd10 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000246 R15: ffffffff8e1444e0 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 dput+0x197/0x2b0 fs/dcache.c:910 __fput+0x68e/0xa70 fs/file_table.c:473 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f802458e929 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc59c10a48 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f80247b7ba0 RCX: 00007f802458e929 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f80247b7ba0 R08: 0000000000000000 R09: 0000000659c10d3f R10: 000000000003fd98 R11: 0000000000000246 R12: 000000000002a542 R13: 00007ffc59c10b40 R14: ffffffffffffffff R15: 00007ffc59c10b60