exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xad8/0x2d70 kernel/exit.c:938 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087 get_signal+0x24ed/0x26c0 kernel/signal.c:3036 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:154! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 3 UID: 0 PID: 6195 Comm: syz.1.47 Not tainted 6.14.0-rc2-syzkaller-00185-g128c8f96eb86 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:filemap_unaccount_folio+0xef/0x860 mm/filemap.c:154 Code: f7 10 cb ff 4c 8d 6b 30 31 ff 89 ee e8 ea 0b cb ff 85 ed 7e 17 e8 e1 10 cb ff 48 c7 c6 00 85 78 8b 48 89 df e8 42 94 11 00 90 <0f> 0b e8 ca 10 cb ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 RSP: 0018:ffffc900070a76c0 EFLAGS: 00010046 RAX: 0000000000080000 RBX: ffffea0001b73800 RCX: ffffc9000c402000 RDX: 0000000000080000 RSI: ffffffff81eec26e RDI: ffff888023370444 RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff20c4ca2 R10: ffffffff90626517 R11: 0000000000000003 R12: ffff88806f4d9738 R13: ffffea0001b73830 R14: 0000000000000000 R15: ffffc900070a7998 FS: 0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f50f6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002f9f6ffc CR3: 000000004a516000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __filemap_remove_folio mm/filemap.c:223 [inline] filemap_remove_folio+0xf1/0x250 mm/filemap.c:256 truncate_inode_folio+0x49/0x70 mm/truncate.c:162 shmem_undo_range+0x36e/0x1170 mm/shmem.c:1108 shmem_truncate_range mm/shmem.c:1224 [inline] shmem_evict_inode+0x3a3/0xba0 mm/shmem.c:1352 evict+0x409/0x960 fs/inode.c:796 iput_final fs/inode.c:1946 [inline] iput fs/inode.c:1972 [inline] iput+0x52a/0x890 fs/inode.c:1958 dentry_unlink_inode+0x29c/0x480 fs/dcache.c:440 __dentry_kill+0x1d0/0x600 fs/dcache.c:643 dput.part.0+0x4b1/0x9b0 fs/dcache.c:885 dput+0x1f/0x30 fs/dcache.c:875 __fput+0x51c/0xb70 fs/file_table.c:472 task_work_run+0x14e/0x250 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7fd0579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f50f655c EFLAGS: 00000296 ORIG_RAX: 00000000000000c0 RAX: 0000000080000000 RBX: 0000000080000000 RCX: 0000000000b36000 RDX: 000000000000000f RSI: 0000000004008032 RDI: 00000000ffffffff RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_unaccount_folio+0xef/0x860 mm/filemap.c:154 Code: f7 10 cb ff 4c 8d 6b 30 31 ff 89 ee e8 ea 0b cb ff 85 ed 7e 17 e8 e1 10 cb ff 48 c7 c6 00 85 78 8b 48 89 df e8 42 94 11 00 90 <0f> 0b e8 ca 10 cb ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 RSP: 0018:ffffc900070a76c0 EFLAGS: 00010046 RAX: 0000000000080000 RBX: ffffea0001b73800 RCX: ffffc9000c402000 RDX: 0000000000080000 RSI: ffffffff81eec26e RDI: ffff888023370444 RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff20c4ca2 R10: ffffffff90626517 R11: 0000000000000003 R12: ffff88806f4d9738 R13: ffffea0001b73830 R14: 0000000000000000 R15: ffffc900070a7998 FS: 0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f50f6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002f9f6ffc CR3: 000000004a516000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi