BUG: Bad page state in process syz-executor  pfn:137715
page:0000000095bf3a48 refcount:0 mapcount:0 mapping:0000000000000000 index:0x2f pfn:0x137715
flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002006 fffffc0003ddc608 ffff8000211675c0 0000000000000000
raw: 000000000000002f ffff0000d585ee88 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 0 PID: 4333 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 bad_page+0x188/0x1a8 mm/page_alloc.c:726
 free_page_is_bad_report+0xf8/0x170 mm/page_alloc.c:1308
 free_page_is_bad mm/page_alloc.c:1318 [inline]
 free_pages_prepare mm/page_alloc.c:1479 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x638/0xb24 mm/page_alloc.c:3414
 free_unref_page_list+0xd8/0x8dc mm/page_alloc.c:3555
 release_pages+0xdac/0xfdc mm/swap.c:1035
 folios_put include/linux/mm.h:1221 [inline]
 folio_batch_move_lru+0x3b4/0x4cc mm/swap.c:245
 lru_add_drain_cpu+0xc4/0x4f4 mm/swap.c:661
 lru_add_drain+0x8c/0x168 mm/swap.c:765
 unmap_region+0xc0/0x290 mm/mmap.c:2337
 do_mas_align_munmap+0xa18/0xf28 mm/mmap.c:2592
 do_brk_munmap+0x74/0x9c mm/mmap.c:3072
 __do_sys_brk mm/mmap.c:237 [inline]
 __se_sys_brk mm/mmap.c:170 [inline]
 __arm64_sys_brk+0x46c/0x70c mm/mmap.c:170
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
BUG: Bad page state in process syz-executor  pfn:137718
page:00000000aab833c2 refcount:0 mapcount:0 mapping:0000000000000000 index:0x2e pfn:0x137718
flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002006 fffffc0003ddc648 ffff8000211675c0 0000000000000000
raw: 000000000000002e ffff0000d585ed90 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 0 PID: 4333 Comm: syz-executor Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 bad_page+0x188/0x1a8 mm/page_alloc.c:726
 free_page_is_bad_report+0xf8/0x170 mm/page_alloc.c:1308
 free_page_is_bad mm/page_alloc.c:1318 [inline]
 free_pages_prepare mm/page_alloc.c:1479 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x638/0xb24 mm/page_alloc.c:3414
 free_unref_page_list+0xd8/0x8dc mm/page_alloc.c:3555
 release_pages+0xdac/0xfdc mm/swap.c:1035
 folios_put include/linux/mm.h:1221 [inline]
 folio_batch_move_lru+0x3b4/0x4cc mm/swap.c:245
 lru_add_drain_cpu+0xc4/0x4f4 mm/swap.c:661
 lru_add_drain+0x8c/0x168 mm/swap.c:765
 unmap_region+0xc0/0x290 mm/mmap.c:2337
 do_mas_align_munmap+0xa18/0xf28 mm/mmap.c:2592
 do_brk_munmap+0x74/0x9c mm/mmap.c:3072
 __do_sys_brk mm/mmap.c:237 [inline]
 __se_sys_brk mm/mmap.c:170 [inline]
 __arm64_sys_brk+0x46c/0x70c mm/mmap.c:170
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
BUG: Bad page state in process syz-executor  pfn:137719
page:00000000c88f32fc refcount:0 mapcount:0 mapping:0000000000000000 index:0x2d pfn:0x137719
flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002006 fffffc0003ddc688 ffff8000211675c0 0000000000000000
raw: 000000000000002d ffff0000d585ec98 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 0 PID: 4333 Comm: syz-executor Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 bad_page+0x188/0x1a8 mm/page_alloc.c:726
 free_page_is_bad_report+0xf8/0x170 mm/page_alloc.c:1308
 free_page_is_bad mm/page_alloc.c:1318 [inline]
 free_pages_prepare mm/page_alloc.c:1479 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x638/0xb24 mm/page_alloc.c:3414
 free_unref_page_list+0xd8/0x8dc mm/page_alloc.c:3555
 release_pages+0xdac/0xfdc mm/swap.c:1035
 folios_put include/linux/mm.h:1221 [inline]
 folio_batch_move_lru+0x3b4/0x4cc mm/swap.c:245
 lru_add_drain_cpu+0xc4/0x4f4 mm/swap.c:661
 lru_add_drain+0x8c/0x168 mm/swap.c:765
 unmap_region+0xc0/0x290 mm/mmap.c:2337
 do_mas_align_munmap+0xa18/0xf28 mm/mmap.c:2592
 do_brk_munmap+0x74/0x9c mm/mmap.c:3072
 __do_sys_brk mm/mmap.c:237 [inline]
 __se_sys_brk mm/mmap.c:170 [inline]
 __arm64_sys_brk+0x46c/0x70c mm/mmap.c:170
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
BUG: Bad page state in process syz-executor  pfn:13771a
page:000000009f056fae refcount:0 mapcount:0 mapping:0000000000000000 index:0x2c pfn:0x13771a
flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002006 ffff8000211675c0 ffff8000211675c0 0000000000000000
raw: 000000000000002c ffff0000d585eba0 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 0 PID: 4333 Comm: syz-executor Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 bad_page+0x188/0x1a8 mm/page_alloc.c:726
 free_page_is_bad_report+0xf8/0x170 mm/page_alloc.c:1308
 free_page_is_bad mm/page_alloc.c:1318 [inline]
 free_pages_prepare mm/page_alloc.c:1479 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x638/0xb24 mm/page_alloc.c:3414
 free_unref_page_list+0xd8/0x8dc mm/page_alloc.c:3555
 release_pages+0xdac/0xfdc mm/swap.c:1035
 folios_put include/linux/mm.h:1221 [inline]
 folio_batch_move_lru+0x3b4/0x4cc mm/swap.c:245
 lru_add_drain_cpu+0xc4/0x4f4 mm/swap.c:661
 lru_add_drain+0x8c/0x168 mm/swap.c:765
 unmap_region+0xc0/0x290 mm/mmap.c:2337
 do_mas_align_munmap+0xa18/0xf28 mm/mmap.c:2592
 do_brk_munmap+0x74/0x9c mm/mmap.c:3072
 __do_sys_brk mm/mmap.c:237 [inline]
 __se_sys_brk mm/mmap.c:170 [inline]
 __arm64_sys_brk+0x46c/0x70c mm/mmap.c:170
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585