BUG: Bad page state in process syz.4.84  pfn:12e50e
page:00000000d23587ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x5002f pfn:0x12e50e
flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002006 fffffc0003a8aa48 fffffc00039e6c48 0000000000000000
raw: 000000000005002f ffff0000ea2a81f0 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 0 PID: 4504 Comm: syz.4.84 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __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:652
 check_free_page_bad+0xf4/0x16c mm/page_alloc.c:1199
 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+0x744/0xaa0 mm/page_alloc.c:3317
 free_unref_page_list+0xdc/0x754 mm/page_alloc.c:3433
 release_pages+0x13c8/0x16e0 mm/swap.c:963
 __pagevec_release+0x84/0xf8 mm/swap.c:983
 pagevec_release include/linux/pagevec.h:81 [inline]
 truncate_inode_pages_range+0x29c/0x9b8 mm/truncate.c:329
 truncate_inode_pages+0x2c/0x3c mm/truncate.c:425
 jfs_remount+0x280/0x484 fs/jfs/super.c:456
 legacy_reconfigure+0xf8/0x110 fs/fs_context.c:634
 reconfigure_super+0x1d4/0x6f4 fs/super.c:938
 do_remount fs/namespace.c:2669 [inline]
 path_mount+0xc80/0x1000 fs/namespace.c:3335
 do_mount fs/namespace.c:3356 [inline]
 __do_sys_mount fs/namespace.c:3564 [inline]
 __se_sys_mount fs/namespace.c:3541 [inline]
 __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3541
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: Bad page state in process syz.4.84  pfn:12a2a9
page:00000000c1b0f06f refcount:0 mapcount:0 mapping:0000000000000000 index:0x5002e pfn:0x12a2a9
flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002006 fffffc0003399cc8 fffffc00039e6c48 0000000000000000
raw: 000000000005002e ffff0000ea2a80f8 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 0 PID: 4504 Comm: syz.4.84 Tainted: G    B             5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __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:652
 check_free_page_bad+0xf4/0x16c mm/page_alloc.c:1199
 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+0x744/0xaa0 mm/page_alloc.c:3317
 free_unref_page_list+0xdc/0x754 mm/page_alloc.c:3433
 release_pages+0x13c8/0x16e0 mm/swap.c:963
 __pagevec_release+0x84/0xf8 mm/swap.c:983
 pagevec_release include/linux/pagevec.h:81 [inline]
 truncate_inode_pages_range+0x29c/0x9b8 mm/truncate.c:329
 truncate_inode_pages+0x2c/0x3c mm/truncate.c:425
 jfs_remount+0x280/0x484 fs/jfs/super.c:456
 legacy_reconfigure+0xf8/0x110 fs/fs_context.c:634
 reconfigure_super+0x1d4/0x6f4 fs/super.c:938
 do_remount fs/namespace.c:2669 [inline]
 path_mount+0xc80/0x1000 fs/namespace.c:3335
 do_mount fs/namespace.c:3356 [inline]
 __do_sys_mount fs/namespace.c:3564 [inline]
 __se_sys_mount fs/namespace.c:3541 [inline]
 __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3541
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
BUG: Bad page state in process syz.4.84  pfn:10e673
page:0000000077b44dc9 refcount:0 mapcount:0 mapping:0000000000000000 index:0x5002d pfn:0x10e673
flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002006 fffffc00039c92c8 fffffc00039e6c48 0000000000000000
raw: 000000000005002d ffff0000ea2a8000 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 1 PID: 4504 Comm: syz.4.84 Tainted: G    B             5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __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:652
 check_free_page_bad+0xf4/0x16c mm/page_alloc.c:1199
 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+0x744/0xaa0 mm/page_alloc.c:3317
 free_unref_page_list+0xdc/0x754 mm/page_alloc.c:3433
 release_pages+0x13c8/0x16e0 mm/swap.c:963
 __pagevec_release+0x84/0xf8 mm/swap.c:983
 pagevec_release include/linux/pagevec.h:81 [inline]
 truncate_inode_pages_range+0x29c/0x9b8 mm/truncate.c:329
 truncate_inode_pages+0x2c/0x3c mm/truncate.c:425
 jfs_remount+0x280/0x484 fs/jfs/super.c:456
 legacy_reconfigure+0xf8/0x110 fs/fs_context.c:634
 reconfigure_super+0x1d4/0x6f4 fs/super.c:938
 do_remount fs/namespace.c:2669 [inline]
 path_mount+0xc80/0x1000 fs/namespace.c:3335
 do_mount fs/namespace.c:3356 [inline]
 __do_sys_mount fs/namespace.c:3564 [inline]
 __se_sys_mount fs/namespace.c:3541 [inline]
 __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3541
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584