last executing test programs:
kernel console output (not intermixed with test programs):
[ 64.918765][ T3482] ------------[ cut here ]------------
[ 64.924340][ T3482] WARNING: ./include/linux/backing-dev.h:243 at __folio_start_writeback+0x8e7/0xa50, CPU#0: kworker/u8:8/3482
[ 64.936071][ T3482] Modules linked in:
[ 64.940119][ T3482] CPU: 0 UID: 0 PID: 3482 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full)
[ 64.949806][ T3482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
[ 64.960017][ T3482] Workqueue: writeback wb_workfn (flush-8:0)
[ 64.966017][ T3482] RIP: 0010:__folio_start_writeback+0x8e7/0xa50
[ 64.972394][ T3482] Code: 8b 05 2d a0 c7 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 e9 90 75 86 09 cc e8 1a f7 c5 ff 90 <0f> 0b 90 e9 e5 fb ff ff e8 0c f7 c5 ff 48 c7 c7 a0 03 40 8e 4c 89
[ 64.992130][ T3482] RSP: 0018:ffffc9000c126ea0 EFLAGS: 00010293
[ 64.998376][ T3482] RAX: ffffffff81fad016 RBX: ffffea0000940940 RCX: ffff888030dd0000
[ 65.006352][ T3482] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 65.014389][ T3482] RBP: ffffc9000c127010 R08: ffffc9000c126f97 R09: 0000000000000000
[ 65.022404][ T3482] R10: ffffc9000c126f80 R11: fffff52001824df3 R12: ffffea0000940948
[ 65.030897][ T3482] R13: 0000000000000000 R14: ffff888148c47000 R15: ffff888148c46de0
[ 65.039009][ T3482] FS: 0000000000000000(0000) GS:ffff8881259f9000(0000) knlGS:0000000000000000
[ 65.048149][ T3482] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 65.054748][ T3482] CR2: 000055cfcdf70168 CR3: 000000000e138000 CR4: 00000000003526f0
[ 65.062818][ T3482] Call Trace:
[ 65.066284][ T3482]
[ 65.069299][ T3482] ? __pfx___folio_start_writeback+0x10/0x10
[ 65.075413][ T3482] ? __pfx_folio_clear_dirty_for_io+0x10/0x10
[ 65.081533][ T3482] ? stack_trace_save+0x9c/0xe0
[ 65.086405][ T3482] __block_write_full_folio+0x75f/0xe10
[ 65.092012][ T3482] ? __pfx_blkdev_get_block+0x10/0x10
[ 65.097402][ T3482] blkdev_writepages+0xd1/0x170
[ 65.102353][ T3482] ? __pfx_blkdev_writepages+0x10/0x10
[ 65.107837][ T3482] ? __pfx_blkdev_writepages+0x10/0x10
[ 65.113649][ T3482] do_writepages+0x32e/0x550
[ 65.118364][ T3482] __writeback_single_inode+0x145/0xff0
[ 65.123911][ T3482] ? wbc_attach_and_unlock_inode+0x3f0/0x5d0
[ 65.129952][ T3482] writeback_sb_inodes+0x6c7/0x1010
[ 65.135177][ T3482] ? __pfx_writeback_sb_inodes+0x10/0x10
[ 65.140899][ T3482] ? __pfx_down_read_trylock+0x10/0x10
[ 65.146361][ T3482] ? __pfx___up_read+0x10/0x10
[ 65.151206][ T3482] __writeback_inodes_wb+0x111/0x240
[ 65.156497][ T3482] wb_writeback+0x44f/0xaf0
[ 65.161057][ T3482] ? queue_io+0x331/0x590
[ 65.165393][ T3482] ? __pfx_wb_writeback+0x10/0x10
[ 65.170604][ T3482] wb_workfn+0xaef/0xef0
[ 65.174873][ T3482] ? __pfx_wb_workfn+0x10/0x10
[ 65.179674][ T3482] ? __lock_acquire+0xab9/0xd20
[ 65.184547][ T3482] ? process_scheduled_works+0x9ef/0x17b0
[ 65.190351][ T3482] ? _raw_spin_unlock_irq+0x23/0x50
[ 65.195606][ T3482] ? process_scheduled_works+0x9ef/0x17b0
[ 65.201407][ T3482] ? process_scheduled_works+0x9ef/0x17b0
[ 65.207171][ T3482] process_scheduled_works+0xade/0x17b0
[ 65.212819][ T3482] ? __pfx_process_scheduled_works+0x10/0x10
[ 65.218868][ T3482] worker_thread+0x8a0/0xda0
[ 65.223561][ T3482] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10
[ 65.229970][ T3482] ? __kthread_parkme+0x7b/0x200
[ 65.234921][ T3482] kthread+0x70e/0x8a0
[ 65.239061][ T3482] ? __pfx_worker_thread+0x10/0x10
[ 65.244174][ T3482] ? __pfx_kthread+0x10/0x10
[ 65.248838][ T3482] ? _raw_spin_unlock_irq+0x23/0x50
[ 65.254052][ T3482] ? lockdep_hardirqs_on+0x9c/0x150
[ 65.259344][ T3482] ? __pfx_kthread+0x10/0x10
[ 65.263958][ T3482] ret_from_fork+0x47c/0x820
[ 65.268724][ T3482] ? __pfx_ret_from_fork+0x10/0x10
[ 65.273968][ T3482] ? __switch_to_asm+0x39/0x70
[ 65.278872][ T3482] ? __switch_to_asm+0x33/0x70
[ 65.283660][ T3482] ? __pfx_kthread+0x10/0x10
[ 65.288320][ T3482] ret_from_fork_asm+0x1a/0x30
[ 65.293108][ T3482]
[ 65.296154][ T3482] Kernel panic - not syncing: kernel: panic_on_warn set ...
[ 65.303600][ T3482] CPU: 0 UID: 0 PID: 3482 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full)
[ 65.313061][ T3482] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
[ 65.323122][ T3482] Workqueue: writeback wb_workfn (flush-8:0)
[ 65.329118][ T3482] Call Trace:
[ 65.332386][ T3482]
[ 65.335304][ T3482] dump_stack_lvl+0x99/0x250
[ 65.339885][ T3482] ? __asan_memcpy+0x40/0x70
[ 65.344464][ T3482] ? __pfx_dump_stack_lvl+0x10/0x10
[ 65.349647][ T3482] ? __pfx__printk+0x10/0x10
[ 65.354276][ T3482] vpanic+0x229/0x6d0
[ 65.358254][ T3482] ? __pfx_vpanic+0x10/0x10
[ 65.362744][ T3482] ? is_bpf_text_address+0x292/0x2b0
[ 65.368018][ T3482] ? is_bpf_text_address+0x26/0x2b0
[ 65.373210][ T3482] panic+0xb9/0xc0
[ 65.376928][ T3482] ? __pfx_panic+0x10/0x10
[ 65.381358][ T3482] ? ret_from_fork_asm+0x1a/0x30
[ 65.386319][ T3482] __warn+0x334/0x4c0
[ 65.390306][ T3482] ? __folio_start_writeback+0x8e7/0xa50
[ 65.395946][ T3482] ? __folio_start_writeback+0x8e7/0xa50
[ 65.401572][ T3482] report_bug+0x2be/0x4f0
[ 65.405909][ T3482] ? __folio_start_writeback+0x8e7/0xa50
[ 65.411533][ T3482] ? __folio_start_writeback+0x8e7/0xa50
[ 65.417168][ T3482] ? __folio_start_writeback+0x8e9/0xa50
[ 65.422789][ T3482] handle_bug+0x84/0x160
[ 65.427020][ T3482] exc_invalid_op+0x1a/0x50
[ 65.431512][ T3482] asm_exc_invalid_op+0x1a/0x20
[ 65.436347][ T3482] RIP: 0010:__folio_start_writeback+0x8e7/0xa50
[ 65.442577][ T3482] Code: 8b 05 2d a0 c7 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 e9 90 75 86 09 cc e8 1a f7 c5 ff 90 <0f> 0b 90 e9 e5 fb ff ff e8 0c f7 c5 ff 48 c7 c7 a0 03 40 8e 4c 89
[ 65.462450][ T3482] RSP: 0018:ffffc9000c126ea0 EFLAGS: 00010293
[ 65.468559][ T3482] RAX: ffffffff81fad016 RBX: ffffea0000940940 RCX: ffff888030dd0000
[ 65.476516][ T3482] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[ 65.484481][ T3482] RBP: ffffc9000c127010 R08: ffffc9000c126f97 R09: 0000000000000000
[ 65.492443][ T3482] R10: ffffc9000c126f80 R11: fffff52001824df3 R12: ffffea0000940948
[ 65.500407][ T3482] R13: 0000000000000000 R14: ffff888148c47000 R15: ffff888148c46de0
[ 65.508373][ T3482] ? __folio_start_writeback+0x8e6/0xa50
[ 65.514017][ T3482] ? __pfx___folio_start_writeback+0x10/0x10
[ 65.519992][ T3482] ? __pfx_folio_clear_dirty_for_io+0x10/0x10
[ 65.526053][ T3482] ? stack_trace_save+0x9c/0xe0
[ 65.530987][ T3482] __block_write_full_folio+0x75f/0xe10
[ 65.536535][ T3482] ? __pfx_blkdev_get_block+0x10/0x10
[ 65.541895][ T3482] blkdev_writepages+0xd1/0x170
[ 65.546734][ T3482] ? __pfx_blkdev_writepages+0x10/0x10
[ 65.552214][ T3482] ? __pfx_blkdev_writepages+0x10/0x10
[ 65.557756][ T3482] do_writepages+0x32e/0x550
[ 65.562357][ T3482] __writeback_single_inode+0x145/0xff0
[ 65.567894][ T3482] ? wbc_attach_and_unlock_inode+0x3f0/0x5d0
[ 65.573865][ T3482] writeback_sb_inodes+0x6c7/0x1010
[ 65.579076][ T3482] ? __pfx_writeback_sb_inodes+0x10/0x10
[ 65.584727][ T3482] ? __pfx_down_read_trylock+0x10/0x10
[ 65.590172][ T3482] ? __pfx___up_read+0x10/0x10
[ 65.594931][ T3482] __writeback_inodes_wb+0x111/0x240
[ 65.600214][ T3482] wb_writeback+0x44f/0xaf0
[ 65.604797][ T3482] ? queue_io+0x331/0x590
[ 65.609124][ T3482] ? __pfx_wb_writeback+0x10/0x10
[ 65.614150][ T3482] wb_workfn+0xaef/0xef0
[ 65.618417][ T3482] ? __pfx_wb_workfn+0x10/0x10
[ 65.623168][ T3482] ? __lock_acquire+0xab9/0xd20
[ 65.628123][ T3482] ? process_scheduled_works+0x9ef/0x17b0
[ 65.633836][ T3482] ? _raw_spin_unlock_irq+0x23/0x50
[ 65.639026][ T3482] ? process_scheduled_works+0x9ef/0x17b0
[ 65.644743][ T3482] ? process_scheduled_works+0x9ef/0x17b0
[ 65.650467][ T3482] process_scheduled_works+0xade/0x17b0
[ 65.656025][ T3482] ? __pfx_process_scheduled_works+0x10/0x10
[ 65.662007][ T3482] worker_thread+0x8a0/0xda0
[ 65.666583][ T3482] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10
[ 65.672906][ T3482] ? __kthread_parkme+0x7b/0x200
[ 65.678330][ T3482] kthread+0x70e/0x8a0
[ 65.682413][ T3482] ? __pfx_worker_thread+0x10/0x10
[ 65.687618][ T3482] ? __pfx_kthread+0x10/0x10
[ 65.692204][ T3482] ? _raw_spin_unlock_irq+0x23/0x50
[ 65.697397][ T3482] ? lockdep_hardirqs_on+0x9c/0x150
[ 65.702629][ T3482] ? __pfx_kthread+0x10/0x10
[ 65.707211][ T3482] ret_from_fork+0x47c/0x820
[ 65.711800][ T3482] ? __pfx_ret_from_fork+0x10/0x10
[ 65.716909][ T3482] ? __switch_to_asm+0x39/0x70
[ 65.721717][ T3482] ? __switch_to_asm+0x33/0x70
[ 65.726469][ T3482] ? __pfx_kthread+0x10/0x10
[ 65.731044][ T3482] ret_from_fork_asm+0x1a/0x30
[ 65.735817][ T3482]
[ 65.739101][ T3482] Kernel Offset: disabled
[ 65.743457][ T3482] Rebooting in 86400 seconds..