last executing test programs: kernel console output (not intermixed with test programs): 1150] ret_from_fork+0x47c/0x820 [ 60.974329][ T1150] ? __pfx_ret_from_fork+0x10/0x10 [ 60.979492][ T1150] ? __switch_to_asm+0x39/0x70 [ 60.984268][ T1150] ? __switch_to_asm+0x33/0x70 [ 60.989075][ T1150] ? __pfx_kthread+0x10/0x10 [ 60.993684][ T1150] ret_from_fork_asm+0x1a/0x30 [ 60.998494][ T1150] [ 61.001510][ T1150] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 61.008779][ T1150] CPU: 1 UID: 0 PID: 1150 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full) [ 61.018226][ T1150] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 61.028262][ T1150] Workqueue: writeback wb_workfn (flush-8:0) [ 61.034231][ T1150] Call Trace: [ 61.037512][ T1150] [ 61.040422][ T1150] dump_stack_lvl+0x99/0x250 [ 61.044998][ T1150] ? __asan_memcpy+0x40/0x70 [ 61.049587][ T1150] ? __pfx_dump_stack_lvl+0x10/0x10 [ 61.054768][ T1150] ? __pfx__printk+0x10/0x10 [ 61.059434][ T1150] vpanic+0x281/0x750 [ 61.063397][ T1150] ? __pfx_vpanic+0x10/0x10 [ 61.067878][ T1150] ? is_bpf_text_address+0x292/0x2b0 [ 61.073172][ T1150] ? is_bpf_text_address+0x26/0x2b0 [ 61.078354][ T1150] panic+0xb9/0xc0 [ 61.082055][ T1150] ? __pfx_panic+0x10/0x10 [ 61.086460][ T1150] ? ret_from_fork_asm+0x1a/0x30 [ 61.091380][ T1150] __warn+0x334/0x4c0 [ 61.095344][ T1150] ? __folio_start_writeback+0x9d5/0xb70 [ 61.100962][ T1150] ? __folio_start_writeback+0x9d5/0xb70 [ 61.106583][ T1150] report_bug+0x2be/0x4f0 [ 61.110909][ T1150] ? __folio_start_writeback+0x9d5/0xb70 [ 61.116537][ T1150] ? __folio_start_writeback+0x9d5/0xb70 [ 61.122159][ T1150] ? __folio_start_writeback+0x9d7/0xb70 [ 61.127781][ T1150] handle_bug+0x84/0x160 [ 61.132017][ T1150] exc_invalid_op+0x1a/0x50 [ 61.136508][ T1150] asm_exc_invalid_op+0x1a/0x20 [ 61.141346][ T1150] RIP: 0010:__folio_start_writeback+0x9d5/0xb70 [ 61.147576][ T1150] Code: 28 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 2e a2 29 00 49 8b 07 25 ff 3f 00 00 e9 1b fa ff ff e8 6c 04 c6 ff 90 <0f> 0b 90 e9 d6 fb ff ff e8 5e 04 c6 ff 48 c7 c7 20 fc 5f 8e 4c 89 [ 61.167174][ T1150] RSP: 0018:ffffc900040f6ea0 EFLAGS: 00010293 [ 61.173237][ T1150] RAX: ffffffff81fadbd4 RBX: ffffea0000930e40 RCX: ffff888026e78000 [ 61.181239][ T1150] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 61.189204][ T1150] RBP: ffffc900040f7010 R08: ffffc900040f6f97 R09: 0000000000000000 [ 61.197167][ T1150] R10: ffffc900040f6f80 R11: fffff5200081edf3 R12: ffffea0000930e48 [ 61.205129][ T1150] R13: 0000000000000000 R14: ffff888148ca6480 R15: ffff888148ca6260 [ 61.213099][ T1150] ? __folio_start_writeback+0x9d4/0xb70 [ 61.218734][ T1150] ? folio_clear_dirty_for_io+0x226/0x880 [ 61.224448][ T1150] ? __pfx___folio_start_writeback+0x10/0x10 [ 61.230419][ T1150] ? __pfx_folio_clear_dirty_for_io+0x10/0x10 [ 61.236480][ T1150] ? stack_trace_save+0x9c/0xe0 [ 61.241344][ T1150] __block_write_full_folio+0x75f/0xe10 [ 61.246890][ T1150] ? __pfx_blkdev_get_block+0x10/0x10 [ 61.252263][ T1150] blkdev_writepages+0xd1/0x170 [ 61.257116][ T1150] ? __pfx_blkdev_writepages+0x10/0x10 [ 61.262585][ T1150] ? __pfx_blkdev_writepages+0x10/0x10 [ 61.268040][ T1150] do_writepages+0x32b/0x550 [ 61.272651][ T1150] __writeback_single_inode+0x145/0xff0 [ 61.278186][ T1150] ? wbc_attach_and_unlock_inode+0x3f0/0x5d0 [ 61.284168][ T1150] writeback_sb_inodes+0x6c7/0x1010 [ 61.289376][ T1150] ? __pfx_writeback_sb_inodes+0x10/0x10 [ 61.295027][ T1150] ? __pfx_down_read_trylock+0x10/0x10 [ 61.300482][ T1150] ? __pfx___up_read+0x10/0x10 [ 61.305250][ T1150] __writeback_inodes_wb+0x111/0x240 [ 61.310534][ T1150] wb_writeback+0x44f/0xaf0 [ 61.315041][ T1150] ? queue_io+0x381/0x590 [ 61.319362][ T1150] ? __pfx_wb_writeback+0x10/0x10 [ 61.324474][ T1150] wb_workfn+0xaef/0xef0 [ 61.328731][ T1150] ? __pfx_wb_workfn+0x10/0x10 [ 61.333514][ T1150] ? __lock_acquire+0xab9/0xd20 [ 61.338386][ T1150] ? process_scheduled_works+0x9ef/0x17b0 [ 61.344114][ T1150] ? _raw_spin_unlock_irq+0x23/0x50 [ 61.349307][ T1150] ? process_scheduled_works+0x9ef/0x17b0 [ 61.355016][ T1150] ? process_scheduled_works+0x9ef/0x17b0 [ 61.360727][ T1150] process_scheduled_works+0xae1/0x17b0 [ 61.366290][ T1150] ? __pfx_process_scheduled_works+0x10/0x10 [ 61.372277][ T1150] worker_thread+0x8a0/0xda0 [ 61.376889][ T1150] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 61.383222][ T1150] ? __kthread_parkme+0x7b/0x200 [ 61.388167][ T1150] kthread+0x711/0x8a0 [ 61.392235][ T1150] ? __pfx_worker_thread+0x10/0x10 [ 61.397339][ T1150] ? __pfx_kthread+0x10/0x10 [ 61.401925][ T1150] ? _raw_spin_unlock_irq+0x23/0x50 [ 61.407115][ T1150] ? lockdep_hardirqs_on+0x9c/0x150 [ 61.412311][ T1150] ? __pfx_kthread+0x10/0x10 [ 61.416898][ T1150] ret_from_fork+0x47c/0x820 [ 61.421492][ T1150] ? __pfx_ret_from_fork+0x10/0x10 [ 61.426607][ T1150] ? __switch_to_asm+0x39/0x70 [ 61.431359][ T1150] ? __switch_to_asm+0x33/0x70 [ 61.436107][ T1150] ? __pfx_kthread+0x10/0x10 [ 61.440693][ T1150] ret_from_fork_asm+0x1a/0x30 [ 61.445463][ T1150] [ 61.448727][ T1150] Kernel Offset: disabled [ 61.453031][ T1150] Rebooting in 86400 seconds..