last executing test programs:
kernel console output (not intermixed with test programs):
Warning: Permanently added '10.128.0.42' (ED25519) to the list of known hosts.
[ 64.993680][ T3553] ------------[ cut here ]------------
[ 64.999380][ T3553] WARNING: ./include/linux/backing-dev.h:243 at __folio_start_writeback+0x8e7/0xa50, CPU#1: kworker/u8:8/3553
[ 65.011205][ T3553] Modules linked in:
[ 65.015296][ T3553] CPU: 1 UID: 0 PID: 3553 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full)
[ 65.024857][ T3553] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
[ 65.035092][ T3553] Workqueue: writeback wb_workfn (flush-8:0)
[ 65.041197][ T3553] RIP: 0010:__folio_start_writeback+0x8e7/0xa50
[ 65.047572][ T3553] Code: 8b 05 bd 2f eb 10 48 3b 84 24 20 01 00 00 75 3b 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 ca f6 c5 ff 90 <0f> 0b 90 e9 e5 fb ff ff e8 bc f6 c5 ff 48 c7 c7 a0 03 60 8e 4c 89
[ 65.067426][ T3553] RSP: 0018:ffffc9000c126ea0 EFLAGS: 00010293
[ 65.073551][ T3553] RAX: ffffffff81fb1086 RBX: ffffea0000926980 RCX: ffff8880311a3c00
[ 65.081552][ T3553] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 65.089638][ T3553] RBP: ffffc9000c127010 R08: ffffc9000c126f97 R09: 0000000000000000
[ 65.098326][ T3553] R10: ffffc9000c126f80 R11: fffff52001824df3 R12: ffffea0000926988
[ 65.106379][ T3553] R13: 0000000000000000 R14: ffff888148cfe480 R15: ffff888148cfe260
[ 65.114501][ T3553] FS: 0000000000000000(0000) GS:ffff8881258bc000(0000) knlGS:0000000000000000
[ 65.123535][ T3553] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 65.130157][ T3553] CR2: 00005566912e1010 CR3: 000000000e338000 CR4: 00000000003526f0
[ 65.138208][ T3553] Call Trace:
[ 65.141495][ T3553]
[ 65.144513][ T3553] ? __pfx___folio_start_writeback+0x10/0x10
[ 65.150542][ T3553] ? __pfx_folio_clear_dirty_for_io+0x10/0x10
[ 65.156720][ T3553] ? stack_trace_save+0x9c/0xe0
[ 65.161758][ T3553] __block_write_full_folio+0x75f/0xe10
[ 65.167434][ T3553] ? __pfx_blkdev_get_block+0x10/0x10
[ 65.172878][ T3553] blkdev_writepages+0xd1/0x170
[ 65.177743][ T3553] ? __pfx_blkdev_writepages+0x10/0x10
[ 65.183410][ T3553] ? __pfx_blkdev_writepages+0x10/0x10
[ 65.188888][ T3553] do_writepages+0x32b/0x550
[ 65.193612][ T3553] __writeback_single_inode+0x145/0xff0
[ 65.199301][ T3553] ? wbc_attach_and_unlock_inode+0x3f0/0x5d0
[ 65.205428][ T3553] writeback_sb_inodes+0x6c7/0x1010
[ 65.210680][ T3553] ? __pfx_writeback_sb_inodes+0x10/0x10
[ 65.216437][ T3553] ? __pfx_down_read_trylock+0x10/0x10
[ 65.222061][ T3553] ? __pfx___up_read+0x10/0x10
[ 65.226946][ T3553] __writeback_inodes_wb+0x111/0x240
[ 65.232259][ T3553] wb_writeback+0x44f/0xaf0
[ 65.236864][ T3553] ? queue_io+0x3d1/0x590
[ 65.241213][ T3553] ? __pfx_wb_writeback+0x10/0x10
[ 65.246375][ T3553] wb_workfn+0xaef/0xef0
[ 65.250659][ T3553] ? __pfx_wb_workfn+0x10/0x10
[ 65.255523][ T3553] ? __lock_acquire+0xab9/0xd20
[ 65.260413][ T3553] ? process_scheduled_works+0x9ef/0x17b0
[ 65.266253][ T3553] ? _raw_spin_unlock_irq+0x23/0x50
[ 65.271484][ T3553] ? process_scheduled_works+0x9ef/0x17b0
[ 65.277288][ T3553] ? process_scheduled_works+0x9ef/0x17b0
[ 65.283086][ T3553] process_scheduled_works+0xade/0x17b0
[ 65.288682][ T3553] ? __pfx_process_scheduled_works+0x10/0x10
[ 65.294752][ T3553] worker_thread+0x8a0/0xda0
[ 65.299355][ T3553] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10
[ 65.305871][ T3553] ? __kthread_parkme+0x7b/0x200
[ 65.310837][ T3553] kthread+0x70e/0x8a0
[ 65.314984][ T3553] ? __pfx_worker_thread+0x10/0x10
[ 65.320106][ T3553] ? __pfx_kthread+0x10/0x10
[ 65.324782][ T3553] ? _raw_spin_unlock_irq+0x23/0x50
[ 65.329989][ T3553] ? lockdep_hardirqs_on+0x9c/0x150
[ 65.335403][ T3553] ? __pfx_kthread+0x10/0x10
[ 65.340012][ T3553] ret_from_fork+0x47c/0x820
[ 65.344906][ T3553] ? __pfx_ret_from_fork+0x10/0x10
[ 65.350131][ T3553] ? __switch_to_asm+0x39/0x70
[ 65.354946][ T3553] ? __switch_to_asm+0x33/0x70
[ 65.359713][ T3553] ? __pfx_kthread+0x10/0x10
[ 65.364406][ T3553] ret_from_fork_asm+0x1a/0x30
[ 65.369202][ T3553]
[ 65.372222][ T3553] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 65.379596][ T3553] CPU: 1 UID: 0 PID: 3553 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full)
[ 65.389058][ T3553] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
[ 65.399133][ T3553] Workqueue: writeback wb_workfn (flush-8:0)
[ 65.405239][ T3553] Call Trace:
[ 65.408569][ T3553]
[ 65.411507][ T3553] dump_stack_lvl+0x99/0x250
[ 65.416122][ T3553] ? __asan_memcpy+0x40/0x70
[ 65.420717][ T3553] ? __pfx_dump_stack_lvl+0x10/0x10
[ 65.425934][ T3553] ? __pfx__printk+0x10/0x10
[ 65.431015][ T3553] vpanic+0x229/0x6d0
[ 65.435023][ T3553] ? __pfx_vpanic+0x10/0x10
[ 65.439552][ T3553] ? is_bpf_text_address+0x292/0x2b0
[ 65.444849][ T3553] ? is_bpf_text_address+0x26/0x2b0
[ 65.450129][ T3553] panic+0xb9/0xc0
[ 65.453863][ T3553] ? __pfx_panic+0x10/0x10
[ 65.458379][ T3553] ? ret_from_fork_asm+0x1a/0x30
[ 65.463414][ T3553] __warn+0x334/0x4c0
[ 65.467405][ T3553] ? __folio_start_writeback+0x8e7/0xa50
[ 65.473038][ T3553] ? __folio_start_writeback+0x8e7/0xa50
[ 65.478660][ T3553] report_bug+0x2be/0x4f0
[ 65.483003][ T3553] ? __folio_start_writeback+0x8e7/0xa50
[ 65.488656][ T3553] ? __folio_start_writeback+0x8e7/0xa50
[ 65.494621][ T3553] ? __folio_start_writeback+0x8e9/0xa50
[ 65.500240][ T3553] handle_bug+0x84/0x160
[ 65.504651][ T3553] exc_invalid_op+0x1a/0x50
[ 65.509143][ T3553] asm_exc_invalid_op+0x1a/0x20
[ 65.513978][ T3553] RIP: 0010:__folio_start_writeback+0x8e7/0xa50
[ 65.520208][ T3553] Code: 8b 05 bd 2f eb 10 48 3b 84 24 20 01 00 00 75 3b 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 ca f6 c5 ff 90 <0f> 0b 90 e9 e5 fb ff ff e8 bc f6 c5 ff 48 c7 c7 a0 03 60 8e 4c 89
[ 65.540492][ T3553] RSP: 0018:ffffc9000c126ea0 EFLAGS: 00010293
[ 65.546601][ T3553] RAX: ffffffff81fb1086 RBX: ffffea0000926980 RCX: ffff8880311a3c00
[ 65.554560][ T3553] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 65.562521][ T3553] RBP: ffffc9000c127010 R08: ffffc9000c126f97 R09: 0000000000000000
[ 65.570660][ T3553] R10: ffffc9000c126f80 R11: fffff52001824df3 R12: ffffea0000926988
[ 65.578730][ T3553] R13: 0000000000000000 R14: ffff888148cfe480 R15: ffff888148cfe260
[ 65.586718][ T3553] ? __folio_start_writeback+0x8e6/0xa50
[ 65.592361][ T3553] ? __pfx___folio_start_writeback+0x10/0x10
[ 65.598333][ T3553] ? __pfx_folio_clear_dirty_for_io+0x10/0x10
[ 65.604564][ T3553] ? stack_trace_save+0x9c/0xe0
[ 65.609413][ T3553] __block_write_full_folio+0x75f/0xe10
[ 65.614948][ T3553] ? __pfx_blkdev_get_block+0x10/0x10
[ 65.620312][ T3553] blkdev_writepages+0xd1/0x170
[ 65.625146][ T3553] ? __pfx_blkdev_writepages+0x10/0x10
[ 65.630779][ T3553] ? __pfx_blkdev_writepages+0x10/0x10
[ 65.636221][ T3553] do_writepages+0x32b/0x550
[ 65.640824][ T3553] __writeback_single_inode+0x145/0xff0
[ 65.646358][ T3553] ? wbc_attach_and_unlock_inode+0x3f0/0x5d0
[ 65.652331][ T3553] writeback_sb_inodes+0x6c7/0x1010
[ 65.657594][ T3553] ? __pfx_writeback_sb_inodes+0x10/0x10
[ 65.663325][ T3553] ? __pfx_down_read_trylock+0x10/0x10
[ 65.668770][ T3553] ? __pfx___up_read+0x10/0x10
[ 65.673537][ T3553] __writeback_inodes_wb+0x111/0x240
[ 65.678825][ T3553] wb_writeback+0x44f/0xaf0
[ 65.683318][ T3553] ? queue_io+0x3d1/0x590
[ 65.687689][ T3553] ? __pfx_wb_writeback+0x10/0x10
[ 65.692744][ T3553] wb_workfn+0xaef/0xef0
[ 65.697074][ T3553] ? __pfx_wb_workfn+0x10/0x10
[ 65.701843][ T3553] ? __lock_acquire+0xab9/0xd20
[ 65.706776][ T3553] ? process_scheduled_works+0x9ef/0x17b0
[ 65.712665][ T3553] ? _raw_spin_unlock_irq+0x23/0x50
[ 65.717858][ T3553] ? process_scheduled_works+0x9ef/0x17b0
[ 65.723597][ T3553] ? process_scheduled_works+0x9ef/0x17b0
[ 65.729333][ T3553] process_scheduled_works+0xade/0x17b0
[ 65.734898][ T3553] ? __pfx_process_scheduled_works+0x10/0x10
[ 65.740895][ T3553] worker_thread+0x8a0/0xda0
[ 65.745498][ T3553] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10
[ 65.752172][ T3553] ? __kthread_parkme+0x7b/0x200
[ 65.757127][ T3553] kthread+0x70e/0x8a0
[ 65.761193][ T3553] ? __pfx_worker_thread+0x10/0x10
[ 65.766381][ T3553] ? __pfx_kthread+0x10/0x10
[ 65.770964][ T3553] ? _raw_spin_unlock_irq+0x23/0x50
[ 65.776153][ T3553] ? lockdep_hardirqs_on+0x9c/0x150
[ 65.781337][ T3553] ? __pfx_kthread+0x10/0x10
[ 65.785915][ T3553] ret_from_fork+0x47c/0x820
[ 65.790661][ T3553] ? __pfx_ret_from_fork+0x10/0x10
[ 65.795856][ T3553] ? __switch_to_asm+0x39/0x70
[ 65.800615][ T3553] ? __switch_to_asm+0x33/0x70
[ 65.805376][ T3553] ? __pfx_kthread+0x10/0x10
[ 65.810055][ T3553] ret_from_fork_asm+0x1a/0x30
[ 65.814820][ T3553]
[ 65.818207][ T3553] Kernel Offset: disabled
[ 65.822614][ T3553] Rebooting in 86400 seconds..