syzbot


WARNING in filemap_unaccount_folio (3)

Status: upstream: reported on 2026/05/02 00:00
Reported-by: syzbot+ff5a0dfc039e9b3164cf@syzkaller.appspotmail.com
First crash: 2d15h, last: 2d15h
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in filemap_unaccount_folio -1 1 754d 754d 0/3 auto-obsoleted due to no activity on 2024/07/18 19:10
upstream WARNING in filemap_unaccount_folio nilfs -1 C inconclusive 13 677d 712d 26/29 fixed on 2024/08/06 11:02
linux-6.1 WARNING in filemap_unaccount_folio (2) -1 1 320d 320d 0/3 auto-obsoleted due to no activity on 2025/09/26 12:13

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6279 at mm/filemap.c:208 filemap_unaccount_folio+0x3ac/0x508 mm/filemap.c:207
Modules linked in:
CPU: 0 PID: 6279 Comm: syz.0.321 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
pstate: 824000c5 (Nzcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : filemap_unaccount_folio+0x3ac/0x508 mm/filemap.c:207
lr : filemap_unaccount_folio+0x3ac/0x508 mm/filemap.c:207
sp : ffff800021067480
x29: ffff800021067490 x28: dfff800000000000 x27: ffff0000c50cbf10
x26: 1fffff8000717020 x25: 1fffff8000717021 x24: dfff800000000000
x23: 05ffd6000000205b x22: 1fffe00018a197e2 x21: 0000000000000003
x20: ffff0000c50cbf10 x19: fffffc00038b8100 x18: ffff800011b9bf60
x17: ffff80001835b000 x16: ffff8000082eea88 x15: ffff800017e3c000
x14: 0000000000000001 x13: 1ffff00002a44071 x12: 0000000000080000
x11: 0000000000022074 x10: ffff8000233ad000 x9 : ffff8000086ddb04
x8 : 0000000000022075 x7 : ffff800008941e34 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 00000000ffffffff x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 filemap_unaccount_folio+0x3ac/0x508 mm/filemap.c:207
 delete_from_page_cache_batch+0x130/0x760 mm/filemap.c:332
 truncate_inode_pages_range+0x25c/0xd68 mm/truncate.c:394
 truncate_inode_pages+0x2c/0x3c mm/truncate.c:476
 kill_bdev block/bdev.c:76 [inline]
 set_blocksize+0x270/0x3f8 block/bdev.c:164
 swsusp_check+0x104/0x414 kernel/power/swap.c:1529
 software_resume+0x11c/0x674 kernel/power/hibernate.c:1000
 resume_store+0xfc/0x1ac kernel/power/hibernate.c:1205
 kobj_attr_store+0x6c/0x90 lib/kobject.c:832
 sysfs_kf_write+0x1f8/0x278 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x348/0x4c0 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x3ec/0x7f0 fs/read_write.c:584
 ksys_write+0x12c/0x224 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 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
irq event stamp: 2010
hardirqs last  enabled at (2009): [<ffff8000088e8344>] kasan_quarantine_put+0xc4/0x200 mm/kasan/quarantine.c:242
hardirqs last disabled at (2010): [<ffff800011b238a8>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
hardirqs last disabled at (2010): [<ffff800011b238a8>] _raw_spin_lock_irq+0x34/0x98 kernel/locking/spinlock.c:170
softirqs last  enabled at (1290): [<ffff800008030954>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1288): [<ffff800008030920>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/02 00:00 linux-6.1.y 4931e0e1673d 753c55b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in filemap_unaccount_folio
* Struck through repros no longer work on HEAD.