ERROR: (device loop2): remounting filesystem as read-only
blkno = 5002d, nblocks = 1
ERROR: (device loop2): dbUpdatePMap: blocks are outside the map
BUG: Bad page state in process jfsCommit  pfn:135a80
page:0000000055a614db refcount:0 mapcount:0 mapping:0000000000000000 index:0x5002d pfn:0x135a80
flags: 0x5ffc00000002007(locked|referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002007 dead000000000100 dead000000000122 0000000000000000
raw: 000000000005002d ffff0000f5b16c98 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 1 PID: 93 Comm: jfsCommit Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 bad_page+0x188/0x1a8 mm/page_alloc.c:699
 free_page_is_bad_report+0xf8/0x170 mm/page_alloc.c:1281
 free_page_is_bad mm/page_alloc.c:1291 [inline]
 free_pages_prepare mm/page_alloc.c:1452 [inline]
 free_pcp_prepare mm/page_alloc.c:1509 [inline]
 free_unref_page_prepare+0x62c/0xb18 mm/page_alloc.c:3384
 free_unref_page+0x7c/0x3a0 mm/page_alloc.c:3479
 __folio_put_small mm/swap.c:97 [inline]
 __folio_put+0xd0/0x12c mm/swap.c:120
 folio_put include/linux/mm.h:1182 [inline]
 put_page include/linux/mm.h:1234 [inline]
 _metapage_homeok+0x130/0x21c fs/jfs/jfs_metapage.h:119
 txUnlock+0x220/0xb78 fs/jfs/jfs_txnmgr.c:933
 txLazyCommit fs/jfs/jfs_txnmgr.c:2683 [inline]
 jfs_lazycommit+0x464/0x918 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
page:0000000055a614db refcount:0 mapcount:0 mapping:0000000000000000 index:0x5002d pfn:0x135a80
flags: 0x5ffc00000002007(locked|referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002007 dead000000000100 dead000000000122 0000000000000000
raw: 000000000005002d ffff0000f5b16c98 00000000ffffffff 0000000000000000
page dumped because: VM_BUG_ON_FOLIO(((unsigned int) folio_ref_count(folio) + 127u <= 127u))
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:1146!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 93 Comm: jfsCommit Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : folio_get include/linux/mm.h:1146 [inline]
pc : get_page include/linux/mm.h:1152 [inline]
pc : put_metapage+0x278/0x2c4 fs/jfs/jfs_metapage.c:721
lr : folio_get include/linux/mm.h:1146 [inline]
lr : get_page include/linux/mm.h:1152 [inline]
lr : put_metapage+0x278/0x2c4 fs/jfs/jfs_metapage.c:721
sp : ffff80001ce77be0
x29: ffff80001ce77be0 x28: ffff80001c3f8138 x27: 1fffe0001eb62d98
x26: 1fffe0001eb62da5 x25: dfff800000000000 x24: 000000000000007f
x23: fffffc0003d6a034 x22: fffffc0003d6a000 x21: ffff0000f5b16cc0
x20: ffff0000f5b16d28 x19: ffff0000f5b16c98 x18: ffff800011a5bd40
x17: 1fffe00033eebd7e x16: ffff800008042d90 x15: 0000000040000000
x14: 0000000000000002 x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff008000087b0008 x10: 0000000000000000 x9 : ffff8000087b0008
x8 : ffff0000c7961bc0 x7 : 0000000000000004 x6 : ffff8000082532dc
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80000a84818c
x2 : ffff00019f75ed10 x1 : 0000000100000000 x0 : 000000000000005c
Call trace:
 folio_get include/linux/mm.h:1146 [inline]
 get_page include/linux/mm.h:1152 [inline]
 put_metapage+0x278/0x2c4 fs/jfs/jfs_metapage.c:721
 txUnlock+0x398/0xb78 fs/jfs/jfs_txnmgr.c:948
 txLazyCommit fs/jfs/jfs_txnmgr.c:2683 [inline]
 jfs_lazycommit+0x464/0x918 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: b00429e1 91220021 aa1603e0 97bc645f (d4210000) 
---[ end trace 0000000000000000 ]---