BUG: Bad page state in process jfsCommit  pfn:5f6f5
page:ffffea00017dbd40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x2c pfn:0x5f6f5
flags: 0xfff00000002007(locked|referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002007 dead000000000100 dead000000000122 0000000000000000
raw: 000000000000002c ffff88802abd3c98 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x100c40(GFP_NOFS|__GFP_HARDWALL), pid 4945, ts 94204244439, free_ts 94191248717
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
 __page_cache_alloc+0xce/0x440 mm/filemap.c:1022
 pagecache_get_page+0x9b6/0xf10 mm/filemap.c:1940
 find_or_create_page include/linux/pagemap.h:420 [inline]
 grab_cache_page include/linux/pagemap.h:502 [inline]
 __get_metapage+0x282/0x1060 fs/jfs/jfs_metapage.c:614
 dtSplitRoot+0x1e5/0x1510 fs/jfs/jfs_dtree.c:1910
 dtSplitUp fs/jfs/jfs_dtree.c:993 [inline]
 dtInsert+0xe67/0x5830 fs/jfs/jfs_dtree.c:871
 jfs_symlink+0x8b2/0xfb0 fs/jfs/namei.c:1019
 vfs_symlink+0x247/0x3d0 fs/namei.c:4437
 do_symlinkat+0x1ab/0x6b0 fs/namei.c:4466
 __do_sys_symlink fs/namei.c:4488 [inline]
 __se_sys_symlink fs/namei.c:4486 [inline]
 __x64_sys_symlink+0x7a/0x90 fs/namei.c:4486
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
 tlb_batch_list_free mm/mmu_gather.c:62 [inline]
 tlb_finish_mmu+0x28b/0x370 mm/mmu_gather.c:374
 exit_mmap+0x3d0/0x640 mm/mmap.c:3218
 __mmput+0x115/0x3b0 kernel/fork.c:1127
 exit_mm+0x588/0x6e0 kernel/exit.c:550
 do_exit+0x5a9/0x20c0 kernel/exit.c:870
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 __do_sys_exit_group kernel/exit.c:1008 [inline]
 __se_sys_exit_group kernel/exit.c:1006 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1006
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
Modules linked in:
CPU: 0 PID: 277 Comm: jfsCommit Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 bad_page+0x14b/0x170 mm/page_alloc.c:652
 check_free_page mm/page_alloc.c:1209 [inline]
 free_pages_prepare mm/page_alloc.c:1334 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x383/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
 txUnlock+0x27e/0xcb0 fs/jfs/jfs_txnmgr.c:933
 txLazyCommit fs/jfs/jfs_txnmgr.c:2717 [inline]
 jfs_lazycommit+0x581/0xb40 fs/jfs/jfs_txnmgr.c:2767
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
page:ffffea00017dbd40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x2c pfn:0x5f6f5
flags: 0xfff00000002007(locked|referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002007 dead000000000100 dead000000000122 0000000000000000
raw: 000000000000002c ffff88802abd3c98 00000000ffffffff 0000000000000000
page dumped because: VM_BUG_ON_PAGE(((unsigned int) page_ref_count(page) + 127u <= 127u))
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x100c40(GFP_NOFS|__GFP_HARDWALL), pid 4945, ts 94204244439, free_ts 94191248717
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
 __page_cache_alloc+0xce/0x440 mm/filemap.c:1022
 pagecache_get_page+0x9b6/0xf10 mm/filemap.c:1940
 find_or_create_page include/linux/pagemap.h:420 [inline]
 grab_cache_page include/linux/pagemap.h:502 [inline]
 __get_metapage+0x282/0x1060 fs/jfs/jfs_metapage.c:614
 dtSplitRoot+0x1e5/0x1510 fs/jfs/jfs_dtree.c:1910
 dtSplitUp fs/jfs/jfs_dtree.c:993 [inline]
 dtInsert+0xe67/0x5830 fs/jfs/jfs_dtree.c:871
 jfs_symlink+0x8b2/0xfb0 fs/jfs/namei.c:1019
 vfs_symlink+0x247/0x3d0 fs/namei.c:4437
 do_symlinkat+0x1ab/0x6b0 fs/namei.c:4466
 __do_sys_symlink fs/namei.c:4488 [inline]
 __se_sys_symlink fs/namei.c:4486 [inline]
 __x64_sys_symlink+0x7a/0x90 fs/namei.c:4486
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
 tlb_batch_list_free mm/mmu_gather.c:62 [inline]
 tlb_finish_mmu+0x28b/0x370 mm/mmu_gather.c:374
 exit_mmap+0x3d0/0x640 mm/mmap.c:3218
 __mmput+0x115/0x3b0 kernel/fork.c:1127
 exit_mm+0x588/0x6e0 kernel/exit.c:550
 do_exit+0x5a9/0x20c0 kernel/exit.c:870
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 __do_sys_exit_group kernel/exit.c:1008 [inline]
 __se_sys_exit_group kernel/exit.c:1006 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1006
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:1224!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 277 Comm: jfsCommit Tainted: G    B             syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:get_page include/linux/mm.h:1224 [inline]
RIP: 0010:put_metapage+0x278/0x280 fs/jfs/jfs_metapage.c:722
Code: 38 c1 0f 8c 00 ff ff ff 4c 89 ef e8 42 be ec fe e9 f3 fe ff ff e8 78 9f a7 fe 48 8b 3c 24 48 c7 c6 a0 56 62 8a e8 f8 89 da fe <0f> 0b 66 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 70
RSP: 0018:ffffc90002d3fce0 EFLAGS: 00010246
RAX: c3e31c2d83a42400 RBX: ffff88802abd3c98 RCX: 0000000000000000
RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff520005a7f90
RBP: 000000000000007f R08: ffff8880b902795b R09: fffff520005a7f4c
R10: dffffc0000000000 R11: ffffed1017204f2c R12: ffff88802abd3cc0
R13: ffffea00017dbd74 R14: 1ffff1100557a798 R15: 1ffff1100557a7a5
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d7d530000 CR3: 000000001f775000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 txUnlock+0x427/0xcb0 fs/jfs/jfs_txnmgr.c:948
 txLazyCommit fs/jfs/jfs_txnmgr.c:2717 [inline]
 jfs_lazycommit+0x581/0xb40 fs/jfs/jfs_txnmgr.c:2767
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace e52e1255d5f658a2 ]---
RIP: 0010:get_page include/linux/mm.h:1224 [inline]
RIP: 0010:put_metapage+0x278/0x280 fs/jfs/jfs_metapage.c:722
Code: 38 c1 0f 8c 00 ff ff ff 4c 89 ef e8 42 be ec fe e9 f3 fe ff ff e8 78 9f a7 fe 48 8b 3c 24 48 c7 c6 a0 56 62 8a e8 f8 89 da fe <0f> 0b 66 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 70
RSP: 0018:ffffc90002d3fce0 EFLAGS: 00010246
RAX: c3e31c2d83a42400 RBX: ffff88802abd3c98 RCX: 0000000000000000
RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff520005a7f90
RBP: 000000000000007f R08: ffff8880b902795b R09: fffff520005a7f4c
R10: dffffc0000000000 R11: ffffed1017204f2c R12: ffff88802abd3cc0
R13: ffffea00017dbd74 R14: 1ffff1100557a798 R15: 1ffff1100557a7a5
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d7d530000 CR3: 000000001f775000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400