BUG: Bad page state in process syz-executor pfn:678b8
page:ffffea00019e2e00 refcount:0 mapcount:0 mapping:ffff88805cae67f8 index:0x2 pfn:0x678b8
aops:z_erofs_cache_aops ino:0
flags: 0xfff00000000001(locked|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000001 dead000000000100 dead000000000122 ffff88805cae67f8
raw: 0000000000000002 0000000000000000 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 0x192840(GFP_NOWAIT|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 11407, tgid 11406 (syz.1.1264), ts 1215610461656, free_ts 1157910707371
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:4486
z_erofs_bind_cache fs/erofs/zdata.c:605 [inline]
z_erofs_pcluster_begin fs/erofs/zdata.c:889 [inline]
z_erofs_do_read_page+0x2181/0x36b0 fs/erofs/zdata.c:1024
z_erofs_pcluster_readmore+0x2cf/0x450 fs/erofs/zdata.c:1833
z_erofs_read_folio+0x237/0x5c0 fs/erofs/zdata.c:1853
filemap_read_folio+0x172/0x760 mm/filemap.c:2420
do_read_cache_folio+0x468/0x7d0 mm/filemap.c:3804
erofs_bread+0x16f/0x630 fs/erofs/data.c:48
erofs_find_target_block fs/erofs/namei.c:103 [inline]
erofs_namei+0x2ae/0xf50 fs/erofs/namei.c:177
erofs_lookup+0x135/0x310 fs/erofs/namei.c:206
__lookup_slow+0x2a1/0x400 fs/namei.c:1702
lookup_slow+0x53/0x70 fs/namei.c:1719
walk_component fs/namei.c:2010 [inline]
link_path_walk+0x990/0xe30 fs/namei.c:2337
path_openat+0x293/0x3230 fs/namei.c:3793
do_filp_open+0x1f5/0x430 fs/namei.c:3824
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_list+0xbe/0x860 mm/page_alloc.c:2504
release_pages+0x1f7a/0x2200 mm/swap.c:1022
tlb_batch_pages_flush mm/mmu_gather.c:99 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:294 [inline]
tlb_flush_mmu+0x379/0x510 mm/mmu_gather.c:301
tlb_finish_mmu+0xf9/0x220 mm/mmu_gather.c:425
exit_mmap+0x428/0xb90 mm/mmap.c:3315
__mmput+0x118/0x3c0 kernel/fork.c:1355
exit_mm+0x1f2/0x2c0 kernel/exit.c:569
do_exit+0x8dd/0x2460 kernel/exit.c:870
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
get_signal+0x12fc/0x13f0 kernel/signal.c:2902
arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
Modules linked in:
CPU: 0 PID: 5773 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
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
detach_page_private include/linux/pagemap.h:539 [inline]
erofs_try_to_free_all_cached_pages+0x295/0x5f0 fs/erofs/zdata.c:657
erofs_try_to_release_workgroup fs/erofs/utils.c:132 [inline]
erofs_shrink_workstation+0x11f/0x290 fs/erofs/utils.c:161
erofs_shrinker_unregister+0x5d/0x170 fs/erofs/utils.c:198
erofs_put_super+0x4e/0x150 fs/erofs/super.c:812
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
erofs_kill_sb+0x4c/0x140 fs/erofs/super.c:794
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f300ef9d897
Code: a2 c7 05 5c ee 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff6f6d1e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f300f031ef0 RCX: 00007f300ef9d897
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff6f6d1f10
RBP: 00007fff6f6d1f10 R08: 00007fff6f6d2f10 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6f6d2fa0
R13: 00007f300f031ef0 R14: 0000000000128f4c R15: 00007fff6f6d2fe0
BUG: Bad page state in process syz-executor pfn:6bc1e
page:ffffea0001af0780 refcount:0 mapcount:0 mapping:ffff88805cae67f8 index:0x3 pfn:0x6bc1e
aops:z_erofs_cache_aops ino:0
flags: 0xfff00000000001(locked|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000001 dead000000000100 dead000000000122 ffff88805cae67f8
raw: 0000000000000003 0000000000000000 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 0x192840(GFP_NOWAIT|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 11407, tgid 11406 (syz.1.1264), ts 1215610482167, free_ts 1157910691599
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:4486
z_erofs_bind_cache fs/erofs/zdata.c:605 [inline]
z_erofs_pcluster_begin fs/erofs/zdata.c:889 [inline]
z_erofs_do_read_page+0x2181/0x36b0 fs/erofs/zdata.c:1024
z_erofs_pcluster_readmore+0x2cf/0x450 fs/erofs/zdata.c:1833
z_erofs_read_folio+0x237/0x5c0 fs/erofs/zdata.c:1853
filemap_read_folio+0x172/0x760 mm/filemap.c:2420
do_read_cache_folio+0x468/0x7d0 mm/filemap.c:3804
erofs_bread+0x16f/0x630 fs/erofs/data.c:48
erofs_find_target_block fs/erofs/namei.c:103 [inline]
erofs_namei+0x2ae/0xf50 fs/erofs/namei.c:177
erofs_lookup+0x135/0x310 fs/erofs/namei.c:206
__lookup_slow+0x2a1/0x400 fs/namei.c:1702
lookup_slow+0x53/0x70 fs/namei.c:1719
walk_component fs/namei.c:2010 [inline]
link_path_walk+0x990/0xe30 fs/namei.c:2337
path_openat+0x293/0x3230 fs/namei.c:3793
do_filp_open+0x1f5/0x430 fs/namei.c:3824
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_list+0xbe/0x860 mm/page_alloc.c:2504
release_pages+0x1f7a/0x2200 mm/swap.c:1022
tlb_batch_pages_flush mm/mmu_gather.c:99 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:294 [inline]
tlb_flush_mmu+0x379/0x510 mm/mmu_gather.c:301
tlb_finish_mmu+0xf9/0x220 mm/mmu_gather.c:425
exit_mmap+0x428/0xb90 mm/mmap.c:3315
__mmput+0x118/0x3c0 kernel/fork.c:1355
exit_mm+0x1f2/0x2c0 kernel/exit.c:569
do_exit+0x8dd/0x2460 kernel/exit.c:870
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
get_signal+0x12fc/0x13f0 kernel/signal.c:2902
arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
Modules linked in:
CPU: 0 PID: 5773 Comm: syz-executor Tainted: G B syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
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
detach_page_private include/linux/pagemap.h:539 [inline]
erofs_try_to_free_all_cached_pages+0x295/0x5f0 fs/erofs/zdata.c:657
erofs_try_to_release_workgroup fs/erofs/utils.c:132 [inline]
erofs_shrink_workstation+0x11f/0x290 fs/erofs/utils.c:161
erofs_shrinker_unregister+0x5d/0x170 fs/erofs/utils.c:198
erofs_put_super+0x4e/0x150 fs/erofs/super.c:812
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
erofs_kill_sb+0x4c/0x140 fs/erofs/super.c:794
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f300ef9d897
Code: a2 c7 05 5c ee 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff6f6d1e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f300f031ef0 RCX: 00007f300ef9d897
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff6f6d1f10
RBP: 00007fff6f6d1f10 R08: 00007fff6f6d2f10 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6f6d2fa0
R13: 00007f300f031ef0 R14: 0000000000128f4c R15: 00007fff6f6d2fe0
BUG: Bad page state in process syz-executor pfn:5effb
page:ffffea00017bfec0 refcount:0 mapcount:0 mapping:ffff88805cae67f8 index:0x4 pfn:0x5effb
aops:z_erofs_cache_aops ino:0
flags: 0xfff00000000001(locked|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000001 dead000000000100 dead000000000122 ffff88805cae67f8
raw: 0000000000000004 0000000000000000 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 0x192840(GFP_NOWAIT|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 11407, tgid 11406 (syz.1.1264), ts 1215610500639, free_ts 1157910680268
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:4486
z_erofs_bind_cache fs/erofs/zdata.c:605 [inline]
z_erofs_pcluster_begin fs/erofs/zdata.c:889 [inline]
z_erofs_do_read_page+0x2181/0x36b0 fs/erofs/zdata.c:1024
z_erofs_pcluster_readmore+0x2cf/0x450 fs/erofs/zdata.c:1833
z_erofs_read_folio+0x237/0x5c0 fs/erofs/zdata.c:1853
filemap_read_folio+0x172/0x760 mm/filemap.c:2420
do_read_cache_folio+0x468/0x7d0 mm/filemap.c:3804
erofs_bread+0x16f/0x630 fs/erofs/data.c:48
erofs_find_target_block fs/erofs/namei.c:103 [inline]
erofs_namei+0x2ae/0xf50 fs/erofs/namei.c:177
erofs_lookup+0x135/0x310 fs/erofs/namei.c:206
__lookup_slow+0x2a1/0x400 fs/namei.c:1702
lookup_slow+0x53/0x70 fs/namei.c:1719
walk_component fs/namei.c:2010 [inline]
link_path_walk+0x990/0xe30 fs/namei.c:2337
path_openat+0x293/0x3230 fs/namei.c:3793
do_filp_open+0x1f5/0x430 fs/namei.c:3824
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_list+0xbe/0x860 mm/page_alloc.c:2504
release_pages+0x1f7a/0x2200 mm/swap.c:1022
tlb_batch_pages_flush mm/mmu_gather.c:99 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:294 [inline]
tlb_flush_mmu+0x379/0x510 mm/mmu_gather.c:301
tlb_finish_mmu+0xf9/0x220 mm/mmu_gather.c:425
exit_mmap+0x428/0xb90 mm/mmap.c:3315
__mmput+0x118/0x3c0 kernel/fork.c:1355
exit_mm+0x1f2/0x2c0 kernel/exit.c:569
do_exit+0x8dd/0x2460 kernel/exit.c:870
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
get_signal+0x12fc/0x13f0 kernel/signal.c:2902
arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
Modules linked in:
CPU: 0 PID: 5773 Comm: syz-executor Tainted: G B syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
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
detach_page_private include/linux/pagemap.h:539 [inline]
erofs_try_to_free_all_cached_pages+0x295/0x5f0 fs/erofs/zdata.c:657
erofs_try_to_release_workgroup fs/erofs/utils.c:132 [inline]
erofs_shrink_workstation+0x11f/0x290 fs/erofs/utils.c:161
erofs_shrinker_unregister+0x5d/0x170 fs/erofs/utils.c:198
erofs_put_super+0x4e/0x150 fs/erofs/super.c:812
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
erofs_kill_sb+0x4c/0x140 fs/erofs/super.c:794
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f300ef9d897
Code: a2 c7 05 5c ee 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff6f6d1e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f300f031ef0 RCX: 00007f300ef9d897
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff6f6d1f10
RBP: 00007fff6f6d1f10 R08: 00007fff6f6d2f10 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6f6d2fa0
R13: 00007f300f031ef0 R14: 0000000000128f4c R15: 00007fff6f6d2fe0