do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page_list+0x119/0x820 mm/page_alloc.c:3433 release_pages+0x186c/0x1be0 mm/swap.c:963 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:241 [inline] tlb_flush_mmu mm/mmu_gather.c:248 [inline] tlb_finish_mmu+0x1b4/0x370 mm/mmu_gather.c:371 unmap_region+0x344/0x3b0 mm/mmap.c:2669 __do_munmap+0x9f8/0xdf0 mm/mmap.c:2899 __vm_munmap+0x140/0x240 mm/mmap.c:2952 __do_sys_munmap mm/mmap.c:2978 [inline] __se_sys_munmap mm/mmap.c:2974 [inline] __x64_sys_munmap+0x67/0x70 mm/mmap.c:2974 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:166! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 4284 Comm: syz.4.8 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:unaccount_page_cache_page+0x75c/0x870 mm/filemap.c:166 Code: e8 29 11 db ff 4c 89 f7 48 c7 c6 00 01 33 8a e8 aa fb 0d 00 0f 0b e8 13 11 db ff 4c 89 f7 48 c7 c6 40 01 33 8a e8 94 fb 0d 00 <0f> 0b 48 85 ed 75 59 e8 f8 10 db ff eb 5d e8 f1 10 db ff 4c 89 f7 RSP: 0018:ffffc90002e0f688 EFLAGS: 00010046 RAX: 5fd989d05f9e8700 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff520005c1ec4 RBP: 1ffffd400039b771 R08: ffff8880b912795b R09: fffff520005c1e80 R10: dffffc0000000000 R11: ffffed1017224f2c R12: ffffea0001cdbb80 R13: dffffc0000000000 R14: ffffea0001cdbb80 R15: ffffea0001cdbb88 FS: 000055557c2c7500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c27f205 CR3: 0000000073ad6000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __delete_from_page_cache+0xbe/0x6d0 mm/filemap.c:231 delete_from_page_cache+0x121/0x190 mm/filemap.c:266 truncate_inode_page+0x8d/0xb0 mm/truncate.c:219 shmem_undo_range+0x53c/0x1930 mm/shmem.c:960 shmem_truncate_range mm/shmem.c:1063 [inline] shmem_evict_inode+0x220/0xa40 mm/shmem.c:1145 evict+0x4c9/0x8d0 fs/inode.c:647 __dentry_kill+0x431/0x650 fs/dcache.c:586 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xd8/0x1a0 fs/dcache.c:893 __fput+0x5ee/0x930 fs/file_table.c:319 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f7a761c9819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc807c35e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffc807c36d0 RCX: 00007f7a761c9819 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00000000000110a4 R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b31820000 R11: 0000000000000246 R12: 00007ffc807c3710 R13: 00007f7a76442fac R14: 000000000001110e R15: 00007f7a76442fa0 Modules linked in: ---[ end trace 6edac392e4ba875f ]--- RIP: 0010:unaccount_page_cache_page+0x75c/0x870 mm/filemap.c:166 Code: e8 29 11 db ff 4c 89 f7 48 c7 c6 00 01 33 8a e8 aa fb 0d 00 0f 0b e8 13 11 db ff 4c 89 f7 48 c7 c6 40 01 33 8a e8 94 fb 0d 00 <0f> 0b 48 85 ed 75 59 e8 f8 10 db ff eb 5d e8 f1 10 db ff 4c 89 f7 RSP: 0018:ffffc90002e0f688 EFLAGS: 00010046 RAX: 5fd989d05f9e8700 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000044 RSI: 0000000000000000 RDI: fffff520005c1ec4 RBP: 1ffffd400039b771 R08: ffff8880b912795b R09: fffff520005c1e80 R10: dffffc0000000000 R11: ffffed1017224f2c R12: ffffea0001cdbb80 R13: dffffc0000000000 R14: ffffea0001cdbb80 R15: ffffea0001cdbb88 FS: 000055557c2c7500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c27f205 CR3: 0000000073ad6000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400