last executing test programs: kernel console output (not intermixed with test programs): _kthread+0x10/0x10 [ 62.522084][ T13] ? _raw_spin_unlock_irq+0x23/0x50 [ 62.527668][ T13] ? lockdep_hardirqs_on+0x9c/0x150 [ 62.533063][ T13] ? __pfx_kthread+0x10/0x10 [ 62.538323][ T13] ret_from_fork+0x47c/0x820 [ 62.543445][ T13] ? __pfx_ret_from_fork+0x10/0x10 [ 62.549269][ T13] ? __switch_to_asm+0x39/0x70 [ 62.554679][ T13] ? __switch_to_asm+0x33/0x70 [ 62.560094][ T13] ? __pfx_kthread+0x10/0x10 [ 62.564974][ T13] ret_from_fork_asm+0x1a/0x30 [ 62.570159][ T13] [ 62.573296][ T13] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 62.581287][ T13] CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full) [ 62.591544][ T13] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 62.602180][ T13] Workqueue: writeback wb_workfn (flush-8:0) [ 62.608369][ T13] Call Trace: [ 62.611824][ T13] [ 62.614832][ T13] dump_stack_lvl+0x99/0x250 [ 62.619539][ T13] ? __asan_memcpy+0x40/0x70 [ 62.624214][ T13] ? __pfx_dump_stack_lvl+0x10/0x10 [ 62.629504][ T13] ? __pfx__printk+0x10/0x10 [ 62.635771][ T13] vpanic+0x281/0x750 [ 62.639932][ T13] ? __pfx_vpanic+0x10/0x10 [ 62.644425][ T13] ? is_bpf_text_address+0x292/0x2b0 [ 62.650139][ T13] ? is_bpf_text_address+0x26/0x2b0 [ 62.655529][ T13] panic+0xb9/0xc0 [ 62.659776][ T13] ? __pfx_panic+0x10/0x10 [ 62.664822][ T13] ? ret_from_fork_asm+0x1a/0x30 [ 62.670238][ T13] __warn+0x334/0x4c0 [ 62.674509][ T13] ? __folio_start_writeback+0x9d5/0xb70 [ 62.680675][ T13] ? __folio_start_writeback+0x9d5/0xb70 [ 62.686990][ T13] report_bug+0x2be/0x4f0 [ 62.691324][ T13] ? __folio_start_writeback+0x9d5/0xb70 [ 62.696946][ T13] ? __folio_start_writeback+0x9d5/0xb70 [ 62.702744][ T13] ? __folio_start_writeback+0x9d7/0xb70 [ 62.708646][ T13] handle_bug+0x84/0x160 [ 62.713321][ T13] exc_invalid_op+0x1a/0x50 [ 62.718201][ T13] asm_exc_invalid_op+0x1a/0x20 [ 62.723245][ T13] RIP: 0010:__folio_start_writeback+0x9d5/0xb70 [ 62.729851][ T13] Code: 28 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 ae a1 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 60 f8 3f 8e 4c 89 [ 62.750435][ T13] RSP: 0018:ffffc90000126ea0 EFLAGS: 00010293 [ 62.756849][ T13] RAX: ffffffff81fa9144 RBX: ffffea00050ad0c0 RCX: ffff88801d2a8000 [ 62.765523][ T13] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 62.774123][ T13] RBP: ffffc90000127010 R08: ffffc90000126f97 R09: 0000000000000000 [ 62.783516][ T13] R10: ffffc90000126f80 R11: fffff52000024df3 R12: ffffea00050ad0c8 [ 62.792297][ T13] R13: 0000000000000000 R14: ffff888148c42b00 R15: ffff888148c428e0 [ 62.800839][ T13] ? __folio_start_writeback+0x9d4/0xb70 [ 62.806854][ T13] ? folio_clear_dirty_for_io+0x226/0x880 [ 62.812964][ T13] ? __pfx___folio_start_writeback+0x10/0x10 [ 62.819237][ T13] ? __pfx_folio_clear_dirty_for_io+0x10/0x10 [ 62.825601][ T13] ? stack_trace_save+0x9c/0xe0 [ 62.831085][ T13] __block_write_full_folio+0x75f/0xe10 [ 62.837229][ T13] ? __pfx_blkdev_get_block+0x10/0x10 [ 62.842883][ T13] blkdev_writepages+0xd1/0x170 [ 62.848035][ T13] ? __pfx_blkdev_writepages+0x10/0x10 [ 62.854319][ T13] ? __pfx_blkdev_writepages+0x10/0x10 [ 62.859832][ T13] do_writepages+0x32e/0x550 [ 62.864900][ T13] __writeback_single_inode+0x145/0xff0 [ 62.871084][ T13] ? wbc_attach_and_unlock_inode+0x3f0/0x5d0 [ 62.878231][ T13] writeback_sb_inodes+0x6c7/0x1010 [ 62.883840][ T13] ? __pfx_writeback_sb_inodes+0x10/0x10 [ 62.890270][ T13] ? __pfx_down_read_trylock+0x10/0x10 [ 62.896709][ T13] ? __pfx___up_read+0x10/0x10 [ 62.901665][ T13] __writeback_inodes_wb+0x111/0x240 [ 62.907049][ T13] wb_writeback+0x44f/0xaf0 [ 62.912187][ T13] ? queue_io+0x3a1/0x590 [ 62.916700][ T13] ? __pfx_wb_writeback+0x10/0x10 [ 62.922368][ T13] wb_workfn+0xaef/0xef0 [ 62.927246][ T13] ? __pfx_wb_workfn+0x10/0x10 [ 62.932775][ T13] ? __lock_acquire+0xab9/0xd20 [ 62.938257][ T13] ? process_scheduled_works+0x9ef/0x17b0 [ 62.944619][ T13] ? _raw_spin_unlock_irq+0x23/0x50 [ 62.950695][ T13] ? process_scheduled_works+0x9ef/0x17b0 [ 62.957198][ T13] ? process_scheduled_works+0x9ef/0x17b0 [ 62.964220][ T13] process_scheduled_works+0xae1/0x17b0 [ 62.971281][ T13] ? __pfx_process_scheduled_works+0x10/0x10 [ 62.977909][ T13] worker_thread+0x8a0/0xda0 [ 62.983387][ T13] kthread+0x711/0x8a0 [ 62.988039][ T13] ? __pfx_worker_thread+0x10/0x10 [ 62.994116][ T13] ? __pfx_kthread+0x10/0x10 [ 62.998893][ T13] ? _raw_spin_unlock_irq+0x23/0x50 [ 63.004406][ T13] ? lockdep_hardirqs_on+0x9c/0x150 [ 63.009717][ T13] ? __pfx_kthread+0x10/0x10 [ 63.014672][ T13] ret_from_fork+0x47c/0x820 [ 63.019288][ T13] ? __pfx_ret_from_fork+0x10/0x10 [ 63.025441][ T13] ? __switch_to_asm+0x39/0x70 [ 63.030546][ T13] ? __switch_to_asm+0x33/0x70 [ 63.035595][ T13] ? __pfx_kthread+0x10/0x10 [ 63.040970][ T13] ret_from_fork_asm+0x1a/0x30 [ 63.046022][ T13] [ 63.049640][ T13] Kernel Offset: disabled [ 63.055430][ T13] Rebooting in 86400 seconds..