RBP: 0000200000000000 R08: 00007feb149f5ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000002240 R13: 00007feb149f5eb0 R14: 00000000000002c2 R15: 0000200000000b00 watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz.6.5584:21533] Modules linked in: irq event stamp: 605774 hardirqs last enabled at (605773): [] irqentry_exit+0x1dd/0x8c0 kernel/entry/common.c:219 hardirqs last disabled at (605774): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (605770): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (605770): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (605770): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 softirqs last disabled at (605739): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (605739): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (605739): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 21533 Comm: syz.6.5584 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xe02/0x15e0 kernel/smp.c:877 Code: 10 4c 89 74 24 10 49 89 d5 48 89 d5 48 89 54 24 18 49 c1 ed 03 83 e5 07 4d 01 e5 83 c5 03 e8 e5 5b 0c 00 f3 90 41 0f b6 45 00 <40> 38 c5 7c 08 84 c0 0f 85 b6 05 00 00 8b 43 08 31 ff 83 e0 01 41 RSP: 0018:ffffc9000bff7860 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880b8443020 RCX: ffffc9000dd6f000 RDX: 0000000000080000 RSI: ffffffff81b27a7b RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: ffff888012af29b0 R12: dffffc0000000000 R13: ffffed1017088605 R14: 0000000000000001 R15: 0000000000000000 FS: 00007feb149f66c0(0000) GS:ffff8881249f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa9b2bb42f8 CR3: 000000004d37b000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1043 kill_bdev block/bdev.c:90 [inline] set_blocksize+0x2ac/0x500 block/bdev.c:207 sb_set_blocksize+0x61/0x320 block/bdev.c:241 fat_fill_super+0x1106/0x4260 fs/fat/inode.c:1636 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1691 vfs_get_tree+0x8e/0x330 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount fs/namespace.c:3712 [inline] path_mount+0x7bf/0x23a0 fs/namespace.c:4022 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount fs/namespace.c:4201 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7feb16790eea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007feb149f5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007feb149f5ef0 RCX: 00007feb16790eea RDX: 0000200000000000 RSI: 0000200000002240 RDI: 00007feb149f5eb0 RBP: 0000200000000000 R08: 00007feb149f5ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000002240 R13: 00007feb149f5eb0 R14: 00000000000002c2 R15: 0000200000000b00 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 21528 Comm: syz.4.5583 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: a6 73 57 00 48 89 df 5b e9 8d 26 5d 00 be 03 00 00 00 5b e9 12 89 ec 02 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 34 24 65 48 8b 15 a8 c9 f3 11 65 8b 05 b9 c9 f3 RSP: 0000:ffffc90000007e38 EFLAGS: 00000002 RAX: 0000000080010002 RBX: ffff8880b8428540 RCX: ffffffff81aac00b RDX: ffff888077b19e80 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff9ae723a0 R12: ffff8880b8428440 R13: 1889800c47581efb R14: ffff888028e0f300 R15: 0000000000000001 FS: 00007fed4d5e66c0(0000) GS:ffff8881248f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fed4319f000 CR3: 0000000039ccf000 CR4: 0000000000350ef0 Call Trace: debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate kernel/time/hrtimer.c:483 [inline] __run_hrtimer kernel/time/hrtimer.c:1745 [inline] __hrtimer_run_queues+0x460/0xc40 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] RIP: 0010:queued_spin_is_locked include/asm-generic/qspinlock.h:57 [inline] RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:101 [inline] RIP: 0010:do_raw_spin_unlock+0x73/0x230 kernel/locking/spinlock_debug.c:141 Code: 00 00 48 89 df e8 3d 8b 8d 00 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 <7c> 08 84 d2 0f 85 6c 01 00 00 8b 03 85 c0 0f 84 f5 00 00 00 48 b8 RSP: 0000:ffffc9000c2dfbc8 EFLAGS: 00000206 RAX: 0000000000000003 RBX: ffff88807dd84960 RCX: ffffffff819a3803 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807dd84960 RBP: ffffc9000c2dfd60 R08: 0000000000000000 R09: ffffed100fbb092c R10: ffff88807dd84963 R11: ffff888077b1a9b0 R12: ffff888055573cf8 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000067 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] do_anonymous_page+0xafa/0x2190 mm/memory.c:5279 do_pte_missing mm/memory.c:4399 [inline] handle_pte_fault mm/memory.c:6273 [inline] __handle_mm_fault+0x1ecf/0x2bb0 mm/memory.c:6411 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6580 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7fed4c6509e6 Code: f0 72 6e 48 63 cd 48 01 c1 49 39 4f 08 72 4c 8d 4d ff 85 ed 74 33 66 0f 1f 44 00 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 <47> 0f b6 0c 08 45 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01 RSP: 002b:00007fed4d5e54a0 EFLAGS: 00010206 RAX: 0000000000d9f001 RBX: 00007fed4d5e5540 RCX: 0000000000000100 RDX: 0000000000000005 RSI: 0000000000000001 RDI: 00007fed4d5e55e0 RBP: 0000000000000102 R08: 00007fed42400000 R09: 0000000000d9f000 R10: 0000000000000000 R11: 00007fed4d5e5550 R12: 0000000000000001 R13: 00007fed4c82fc40 R14: 0000000000000000 R15: 00007fed4d5e55e0