ERROR: (device loop2): remounting filesystem as read-only
BUG: Bad page state in process jfsCommit  pfn:77176
page:ffffea0001dc5d80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x50030 pfn:0x77176
flags: 0xfff0000000800d(locked|referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff0000000800d dead000000000100 dead000000000122 0000000000000000
raw: 0000000000050030 ffff88802dcc7e88 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 0x140c40(GFP_NOFS|__GFP_COMP|__GFP_HARDWALL), pid 8076, tgid 8074 (syz.2.945), ts 170652100548, free_ts 158332850049
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
 prep_new_page mm/page_alloc.c:1588 [inline]
 get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
 folio_alloc+0x1e/0x30 mm/mempolicy.c:2289
 filemap_alloc_folio+0xdf/0x490 mm/filemap.c:1004
 __filemap_get_folio+0x3ea/0xbb0 mm/filemap.c:1962
 pagecache_get_page+0x2a/0x250 mm/folio-compat.c:99
 find_or_create_page include/linux/pagemap.h:755 [inline]
 grab_cache_page include/linux/pagemap.h:877 [inline]
 __get_metapage+0x2a8/0xfa0 fs/jfs/jfs_metapage.c:613
 dtSplitRoot+0x203/0x16b0 fs/jfs/jfs_dtree.c:1910
 dtSplitUp fs/jfs/jfs_dtree.c:993 [inline]
 dtInsert+0xed5/0x5de0 fs/jfs/jfs_dtree.c:871
 jfs_mkdir+0x75c/0xac0 fs/jfs/namei.c:270
 vfs_mkdir+0x296/0x440 fs/namei.c:4121
 do_mkdirat+0x1dc/0x450 fs/namei.c:4144
 __do_sys_mkdirat fs/namei.c:4159 [inline]
 __se_sys_mkdirat fs/namei.c:4157 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4157
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 kasan_depopulate_vmalloc_pte+0x75/0x90 mm/kasan/shadow.c:427
 apply_to_pte_range mm/memory.c:2604 [inline]
 apply_to_pmd_range mm/memory.c:2648 [inline]
 apply_to_pud_range mm/memory.c:2684 [inline]
 apply_to_p4d_range mm/memory.c:2720 [inline]
 __apply_to_page_range+0x860/0xdd0 mm/memory.c:2756
 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:544
 __purge_vmap_area_lazy+0xfa7/0x1af0 mm/vmalloc.c:1778
 drain_vmap_area_work+0x40/0xd0 mm/vmalloc.c:1812
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Modules linked in:
CPU: 1 PID: 113 Comm: jfsCommit Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 bad_page+0x14b/0x170 mm/page_alloc.c:539
 free_page_is_bad mm/page_alloc.c:988 [inline]
 free_pages_prepare mm/page_alloc.c:1173 [inline]
 free_unref_page_prepare+0x85f/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 txUnlock+0x27e/0xcb0 fs/jfs/jfs_txnmgr.c:933
 txLazyCommit fs/jfs/jfs_txnmgr.c:2683 [inline]
 jfs_lazycommit+0x56e/0xa70 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
page:ffffea0001dc5d80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x50030 pfn:0x77176
flags: 0xfff0000000800d(locked|referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff0000000800d dead000000000100 dead000000000122 0000000000000000
raw: 0000000000050030 ffff88802dcc7e88 00000000ffffffff 0000000000000000
page dumped because: VM_BUG_ON_FOLIO(((unsigned int) folio_ref_count(folio) + 127u <= 127u))
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x140c40(GFP_NOFS|__GFP_COMP|__GFP_HARDWALL), pid 8076, tgid 8074 (syz.2.945), ts 170652100548, free_ts 158332850049
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
 prep_new_page mm/page_alloc.c:1588 [inline]
 get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4500
 folio_alloc+0x1e/0x30 mm/mempolicy.c:2289
 filemap_alloc_folio+0xdf/0x490 mm/filemap.c:1004
 __filemap_get_folio+0x3ea/0xbb0 mm/filemap.c:1962
 pagecache_get_page+0x2a/0x250 mm/folio-compat.c:99
 find_or_create_page include/linux/pagemap.h:755 [inline]
 grab_cache_page include/linux/pagemap.h:877 [inline]
 __get_metapage+0x2a8/0xfa0 fs/jfs/jfs_metapage.c:613
 dtSplitRoot+0x203/0x16b0 fs/jfs/jfs_dtree.c:1910
 dtSplitUp fs/jfs/jfs_dtree.c:993 [inline]
 dtInsert+0xed5/0x5de0 fs/jfs/jfs_dtree.c:871
 jfs_mkdir+0x75c/0xac0 fs/jfs/namei.c:270
 vfs_mkdir+0x296/0x440 fs/namei.c:4121
 do_mkdirat+0x1dc/0x450 fs/namei.c:4144
 __do_sys_mkdirat fs/namei.c:4159 [inline]
 __se_sys_mkdirat fs/namei.c:4157 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4157
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 kasan_depopulate_vmalloc_pte+0x75/0x90 mm/kasan/shadow.c:427
 apply_to_pte_range mm/memory.c:2604 [inline]
 apply_to_pmd_range mm/memory.c:2648 [inline]
 apply_to_pud_range mm/memory.c:2684 [inline]
 apply_to_p4d_range mm/memory.c:2720 [inline]
 __apply_to_page_range+0x860/0xdd0 mm/memory.c:2756
 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:544
 __purge_vmap_area_lazy+0xfa7/0x1af0 mm/vmalloc.c:1778
 drain_vmap_area_work+0x40/0xd0 mm/vmalloc.c:1812
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
------------[ cut here ]------------
kernel BUG at include/linux/mm.h:1458!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 113 Comm: jfsCommit Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:folio_get include/linux/mm.h:1458 [inline]
RIP: 0010:get_page include/linux/mm.h:1464 [inline]
RIP: 0010:put_metapage+0x253/0x340 fs/jfs/jfs_metapage.c:750
Code: 38 c1 0f 8c 32 ff ff ff 4c 89 ef e8 e7 71 d9 fe e9 25 ff ff ff e8 cd 3a 81 fe 48 8b 3c 24 48 c7 c6 80 09 04 8b e8 6d a4 c1 fe <0f> 0b 4c 8b 2c 24 4c 89 ee 48 81 e6 ff 0f 00 00 31 ff e8 e6 3e 81
RSP: 0018:ffffc90002cc7cc0 EFLAGS: 00010246
RAX: 73f78d2d6532f100 RBX: ffff88802dcc7e88 RCX: 73f78d2d6532f100
RDX: 0000000000000000 RSI: ffffffff8b1c8f80 RDI: ffffffff8b1c8f40
RBP: 000000000000007f R08: ffffffff8e8b19af R09: 1ffffffff1d16335
R10: dffffc0000000000 R11: fffffbfff1d16336 R12: ffff88802dcc7eb0
R13: ffffea0001dc5db4 R14: 1ffff11005b98fd6 R15: 1ffff11005b98fe3
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d80aff8 CR3: 000000006122c000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 txUnlock+0x427/0xcb0 fs/jfs/jfs_txnmgr.c:948
 txLazyCommit fs/jfs/jfs_txnmgr.c:2683 [inline]
 jfs_lazycommit+0x56e/0xa70 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:folio_get include/linux/mm.h:1458 [inline]
RIP: 0010:get_page include/linux/mm.h:1464 [inline]
RIP: 0010:put_metapage+0x253/0x340 fs/jfs/jfs_metapage.c:750
Code: 38 c1 0f 8c 32 ff ff ff 4c 89 ef e8 e7 71 d9 fe e9 25 ff ff ff e8 cd 3a 81 fe 48 8b 3c 24 48 c7 c6 80 09 04 8b e8 6d a4 c1 fe <0f> 0b 4c 8b 2c 24 4c 89 ee 48 81 e6 ff 0f 00 00 31 ff e8 e6 3e 81
RSP: 0018:ffffc90002cc7cc0 EFLAGS: 00010246
RAX: 73f78d2d6532f100 RBX: ffff88802dcc7e88 RCX: 73f78d2d6532f100
RDX: 0000000000000000 RSI: ffffffff8b1c8f80 RDI: ffffffff8b1c8f40
RBP: 000000000000007f R08: ffffffff8e8b19af R09: 1ffffffff1d16335
R10: dffffc0000000000 R11: fffffbfff1d16336 R12: ffff88802dcc7eb0
R13: ffffea0001dc5db4 R14: 1ffff11005b98fd6 R15: 1ffff11005b98fe3
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d80aff8 CR3: 000000006122c000 CR4: 00000000003506f0