watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [udevd:6950] Modules linked in: irq event stamp: 450795 hardirqs last enabled at (450794): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline] hardirqs last enabled at (450794): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:95 hardirqs last disabled at (450795): [] __el1_irq arch/arm64/kernel/entry-common.c:557 [inline] hardirqs last disabled at (450795): [] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:575 softirqs last enabled at (446310): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (446345): [] __do_softirq+0x14/0x20 kernel/softirq.c:595 CPU: 0 UID: 0 PID: 6950 Comm: udevd Not tainted 6.13.0-rc3-syzkaller-00020-g573067a5a685 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : preempt_count arch/arm64/include/asm/preempt.h:13 [inline] pc : check_kcov_mode kernel/kcov.c:183 [inline] pc : write_comp_data kernel/kcov.c:246 [inline] pc : __sanitizer_cov_trace_cmp4+0x14/0xa0 kernel/kcov.c:288 lr : rose_find_socket+0x7c/0x130 net/rose/af_rose.c:309 sp : ffff800080007b60 x29: ffff800080007b70 x28: 1ffff00012f27be0 x27: 00000000000000ff x26: 00000000000003e7 x25: dfff800000000000 x24: 00000000fffff034 x23: dfff800000000000 x22: 0000000000000000 x21: ffff0000cb59a000 x20: 00000000fffff034 x19: ffff0000d22cb400 x18: ffff8000a44c7a10 x17: ffff800123ef6000 x16: ffff80008069d55c x15: ffff700010000f54 x14: 1ffff00010000f54 x13: 0000000000000004 x12: ffffffffffffffff x11: ffff700010000f54 x10: 0000000000ff0100 x9 : 0000000000000301 x8 : ffff0000d249bc80 x7 : ffff80008a73944c x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008047cdcc x2 : 0000000000000001 x1 : 00000000fffff034 x0 : 0000000000000000 Call trace: preempt_count arch/arm64/include/asm/preempt.h:13 [inline] (P) check_kcov_mode kernel/kcov.c:183 [inline] (P) write_comp_data kernel/kcov.c:246 [inline] (P) __sanitizer_cov_trace_cmp4+0x14/0xa0 kernel/kcov.c:288 (P) rose_loopback_timer+0x1bc/0x4bc net/rose/rose_loopback.c:91 call_timer_fn+0x1b4/0x8b8 kernel/time/timer.c:1793 expire_timers kernel/time/timer.c:1844 [inline] __run_timers kernel/time/timer.c:2418 [inline] __run_timer_base+0x56c/0x7b4 kernel/time/timer.c:2430 run_timer_base kernel/time/timer.c:2439 [inline] run_timer_softirq+0xcc/0x194 kernel/time/timer.c:2449 handle_softirqs+0x320/0xd34 kernel/softirq.c:561 __do_softirq+0x14/0x20 kernel/softirq.c:595 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:442 [inline] __irq_exit_rcu+0x1d8/0x544 kernel/softirq.c:662 irq_exit_rcu+0x14/0x84 kernel/softirq.c:678 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 leave_rcu+0x70/0x164 fs/namei.c:742 (P) try_to_unlazy+0x284/0x500 fs/namei.c:851 may_lookup fs/namei.c:1828 [inline] link_path_walk+0x66c/0xc44 fs/namei.c:2425 path_openat+0x1d0/0x2b14 fs/namei.c:3983 do_filp_open+0x1e8/0x404 fs/namei.c:4014 do_sys_openat2+0x124/0x1b8 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1428 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 9933 Comm: syz.4.870 Not tainted 6.13.0-rc3-syzkaller-00020-g573067a5a685 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x15c/0xd04 kernel/locking/qspinlock.c:380 lr : queued_spin_lock_slowpath+0x168/0xd04 kernel/locking/qspinlock.c:380 sp : ffff80009bce7940 x29: ffff80009bce7a00 x28: 1ffff00012545d44 x27: dfff800000000000 x26: 1ffff0001379cf54 x25: ffff80009bce7980 x24: dfff800000000000 x23: ffff80009bce79c0 x22: ffff70001379cf30 x21: 0000000000000001 x20: 1ffff0001379cf38 x19: ffff800092a2ea20 x18: 0000000000000000 x17: 0000000000000000 x16: ffff800080bf1494 x15: 0000000000000001 x14: 1ffff00012545d44 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700012545d45 x10: 1ffff00012545d44 x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff80008a7398a4 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008b6c1928 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] (P) queued_spin_lock_slowpath+0x15c/0xd04 kernel/locking/qspinlock.c:380 (P) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2ec/0x334 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] rose_remove_socket net/rose/af_rose.c:154 [inline] rose_destroy_socket+0x38/0x4a8 net/rose/af_rose.c:363 rose_release+0x1e4/0x530 __sock_release net/socket.c:640 [inline] sock_close+0xa4/0x1e8 net/socket.c:1408 __fput+0x1bc/0x75c fs/file_table.c:450 ____fput+0x20/0x30 fs/file_table.c:478 task_work_run+0x230/0x2e0 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600