watchdog: BUG: soft lockup - CPU#0 stuck for 54s! [syz.3.754:9107] Modules linked in: irq event stamp: 12692 hardirqs last enabled at (12691): [] local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline] hardirqs last enabled at (12691): [] el0_svc+0x50/0x1d8 arch/arm64/kernel/entry-common.c:795 hardirqs last disabled at (12692): [] __el1_irq arch/arm64/kernel/entry-common.c:565 [inline] hardirqs last disabled at (12692): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:581 softirqs last enabled at (12546): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (12546): [] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (12546): [] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1781 softirqs last disabled at (12544): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (12544): [] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (12544): [] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1774 CPU: 0 UID: 0 PID: 9107 Comm: syz.3.754 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 pstate: 43400005 (nZcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : should_fail_ex+0x188/0x58c lib/fault-inject.c:180 lr : should_fail+0x14/0x24 lib/fault-inject.c:184 sp : ffff800090347b80 x29: ffff800090347b80 x28: ffff0000d0741d80 x27: 0000000000000000 x26: 1fffe0001a0e83b0 x25: 1ffff00012068fd6 x24: dfff800000000000 x23: ffff800090347be0 x22: ffff700012068f7c x21: 0000000020001100 x20: 00000000000000d0 x19: ffff800090347c00 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000001306f19 x13: 00000000000001c1 x12: 00000000000001c1 x11: 00000000c9cfd889 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000000000 x7 : ffff800080a2d308 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800090347b00 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000000 Call trace: should_fail_ex+0x188/0x58c lib/fault-inject.c:180 (P) should_fail_usercopy+0x20/0x30 lib/fault-inject-usercopy.c:35 _inline_copy_from_user+0x3c/0x174 include/linux/uaccess.h:170 copy_from_user include/linux/uaccess.h:222 [inline] __do_sys_clock_adjtime kernel/time/posix-timers.c:1178 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1172 [inline] __arm64_sys_clock_adjtime+0xf8/0x2b0 kernel/time/posix-timers.c:1172 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 9131 Comm: syz.8.756 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:363 [inline] pc : __smp_call_function_single+0x49c/0x7ec kernel/smp.c:750 lr : csd_lock_wait kernel/smp.c:363 [inline] lr : __smp_call_function_single+0x4b4/0x7ec kernel/smp.c:750 sp : ffff8000930b73a0 x29: ffff8000930b7490 x28: dfff800000000000 x27: ffff700012616e7c x26: 0000000000000000 x25: ffff0000d014bb08 x24: 0000000000000000 x23: 0000000000000001 x22: ffff8000930b7400 x21: 0000000000000011 x20: 0000000000000000 x19: ffff8000930b7408 x18: 00000000ffffffff x17: 0000000000000003 x16: ffff800088a77000 x15: ffff80008a728000 x14: 000000000074c8d1 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff700012616e82 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000011 x6 : 0000000000000000 x5 : ffff8000930b7420 x4 : ffff8000885fd780 x3 : ffff80008059d420 x2 : 0000000000000000 x1 : ffff0000d014bb00 x0 : 0000000000000000 Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:233 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) csd_lock_wait kernel/smp.c:363 [inline] (P) __smp_call_function_single+0x49c/0x7ec kernel/smp.c:750 (P) smp_call_function_single+0x40/0x54 kernel/smp.c:766 rcu_barrier+0x2a8/0x4ec kernel/rcu/tree.c:3956 wg_pm_notification+0x130/0x14c drivers/net/wireguard/device.c:91 notifier_call_chain+0x1a4/0x4cc kernel/notifier.c:85 notifier_call_chain_robust+0x54/0xc4 kernel/notifier.c:120 blocking_notifier_call_chain_robust+0x74/0xa8 kernel/notifier.c:345 pm_notifier_call_chain_robust+0x34/0x60 kernel/power/main.c:172 snapshot_open+0x17c/0x270 kernel/power/user.c:77 misc_open+0x2dc/0x338 drivers/char/misc.c:163 chrdev_open+0x398/0x3e8 fs/char_dev.c:411 do_dentry_open+0x5c4/0xfbc fs/open.c:996 vfs_open+0x44/0x2dc fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x1084/0x18f0 fs/namei.c:5000 do_file_open+0x1c8/0x2e8 fs/namei.c:5029 do_sys_openat2+0x114/0x1e8 fs/open.c:1417 do_sys_open+0xb0/0xe0 fs/open.c:1423 __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 bridge0: port 1(bridge_slave_0) entered learning state bridge0: port 2(bridge_slave_1) entered learning state bridge0: port 3(syz_tun) entered learning state