watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [kworker/u8:3:207]
CPU#0 Utilization every 22s during lockup:
	#1: 100% system,	  1% softirq,	  1% hardirq,	  0% idle
	#2: 100% system,	  0% softirq,	  1% hardirq,	  0% idle
	#3: 100% system,	  1% softirq,	  1% hardirq,	  0% idle
	#4: 100% system,	  0% softirq,	  1% hardirq,	  0% idle
	#5: 100% system,	  1% softirq,	  1% hardirq,	  0% idle
Modules linked in:
CPU: 0 UID: 0 PID: 207 Comm: kworker/u8:3 Not tainted 6.12.38-syzkaller-gbf0fb8bb181b #0 d02c7cfa86e34ad1734bbfdc1f5f1c3ce9be47fc
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:csd_lock_wait kernel/smp.c:349 [inline]
RIP: 0010:smp_call_function_many_cond+0xa24/0xf30 kernel/smp.c:884
Code: 75 79 41 8b 5d 00 89 de 83 e6 01 31 ff e8 14 2a 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 c0 25 0a 00 eb 38 f3 90 <41> 0f b6 04 1e 84 c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 a4 25
RSP: 0018:ffffc90000f1e300 EFLAGS: 00000293
RAX: ffffffff817ba5dc RBX: dffffc0000000000 RCX: ffff888120fdb900
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000f1e440 R08: ffffc90000f1e287 R09: 1ffff920001e3c50
R10: dffffc0000000000 R11: ffffffff81457550 R12: ffff8881f6e50d08
R13: ffff8881f6f71f28 R14: 1ffff1103edee3e5 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555576ac4a8 CR3: 000000011ed98000 CR4: 00000000003526b0
DR0: fffffffffffffff8 DR1: 0000000000000006 DR2: 0200000000000000
DR3: 0000000000000005 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x44/0x90 kernel/smp.c:1051
 native_flush_tlb_multi+0x14c/0x220 arch/x86/mm/tlb.c:-1
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:985 [inline]
 flush_tlb_mm_range+0x35b/0x4f0 arch/x86/mm/tlb.c:1073
 flush_tlb_page arch/x86/include/asm/tlbflush.h:255 [inline]
 ptep_clear_flush+0x115/0x150 mm/pgtable-generic.c:102
 page_vma_mkclean_one+0x388/0x5b0 mm/rmap.c:1048
 page_mkclean_one+0x173/0x220 mm/rmap.c:1089
 rmap_walk_file+0x487/0x5f0 mm/rmap.c:2707
 rmap_walk mm/rmap.c:2725 [inline]
 folio_mkclean+0x1fb/0x2e0 mm/rmap.c:1121
 folio_clear_dirty_for_io+0x134/0x5b0 mm/page-writeback.c:3030
 mpage_submit_folio+0x8b/0x320 fs/ext4/inode.c:1913
 mpage_process_page_bufs+0x6fd/0x9e0 fs/ext4/inode.c:2045
 mpage_prepare_extent_to_map+0xc3d/0x1350 fs/ext4/inode.c:2546
 ext4_do_writepages+0xc05/0x3bc0 fs/ext4/inode.c:2688
 ext4_writepages+0x268/0x4f0 fs/ext4/inode.c:2824
 do_writepages+0x3bf/0x7b0 mm/page-writeback.c:2689
 __writeback_single_inode+0xba/0xb80 fs/fs-writeback.c:1664
 writeback_sb_inodes+0x654/0xf20 fs/fs-writeback.c:1960
 __writeback_inodes_wb+0x126/0x280 fs/fs-writeback.c:2031
 wb_writeback+0x3b6/0x860 fs/fs-writeback.c:2142
 wb_check_old_data_flush fs/fs-writeback.c:2246 [inline]
 wb_do_writeback fs/fs-writeback.c:2299 [inline]
 wb_workfn+0x9f7/0xee0 fs/fs-writeback.c:2327
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d2/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
 kthread+0x2ca/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1584 Comm: syz.4.368 Not tainted 6.12.38-syzkaller-gbf0fb8bb181b #0 d02c7cfa86e34ad1734bbfdc1f5f1c3ce9be47fc
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__vga_put drivers/pci/vgaarb.c:378 [inline]
RIP: 0010:vga_put drivers/pci/vgaarb.c:551 [inline]
RIP: 0010:vga_arb_release+0x2b4/0x950 drivers/pci/vgaarb.c:1455
Code: c0 0f 85 91 01 00 00 48 89 5d b0 41 8b 46 20 89 45 d4 4d 8d 6e 24 4d 89 ec 49 c1 ec 03 43 0f b6 04 3c 84 c0 0f 85 8b 01 00 00 <41> 8b 5d 00 31 ff 89 de e8 5f 83 98 fe 85 db 74 47 43 0f b6 04 3c
RSP: 0018:ffffc90010487cf8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88810fa52520 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90010487c60
RBP: ffffc90010487d80 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52002090f8c R12: 1ffff11021f4a4a4
R13: ffff88810fa52524 R14: ffff88810fa52500 R15: dffffc0000000000
FS:  0000555587387500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e119ff8 CR3: 0000000129cfe000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __fput+0x1fb/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e0/0x250 kernel/task_work.c:240
 resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe2e578eb69
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007ffcfe2fd0a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fe2e59b7ba0 RCX: 00007fe2e578eb69
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fe2e59b7ba0 R08: 0000000000000000 R09: 00000028fe2fd39f
R10: 00007fe2e59b7ac0 R11: 0000000000000246 R12: 000000000000fd3a
R13: 00007fe2e59b6160 R14: ffffffffffffffff R15: 00007ffcfe2fd1c0
 </TASK>