loop0: rw=2049, want=45112, limit=40427 general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 15582 Comm: syz.0.5006 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:f2fs_test_and_clear_bit fs/f2fs/f2fs.h:2924 [inline] RIP: 0010:update_sit_entry+0x5f7/0xf50 fs/f2fs/segment.c:2382 Code: 00 00 49 8d 5d 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 d7 1a 92 ff 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 5c 08 00 00 44 0f b6 33 0f b6 45 bf 44 RSP: 0018:ffffc900011af350 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff8881280562c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900011af3d0 R08: ffff8881269b607f R09: 1ffff11024d36c0f R10: dffffc0000000000 R11: ffffed1024d36c10 R12: dffffc0000000000 R13: ffff88811d3a4078 R14: ffff8881269b60c0 R15: ffff8881269b6000 FS: 00007f80486756c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f05276acdac CR3: 000000010f78f000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_invalidate_blocks+0x267/0x360 fs/f2fs/segment.c:2413 f2fs_truncate_data_blocks_range+0x7b4/0xec0 fs/f2fs/file.c:667 f2fs_truncate_data_blocks+0xf7/0x140 fs/f2fs/file.c:696 truncate_dnode fs/f2fs/node.c:953 [inline] truncate_nodes+0x5e7/0xd80 fs/f2fs/node.c:994 f2fs_truncate_inode_blocks+0x564/0xfe0 fs/f2fs/node.c:1177 f2fs_do_truncate_blocks+0x72a/0xa10 fs/f2fs/file.c:785 f2fs_truncate_blocks+0x115/0x310 fs/f2fs/file.c:813 f2fs_truncate+0x1d7/0x3d0 fs/f2fs/file.c:865 f2fs_evict_inode+0x697/0x14e0 fs/f2fs/inode.c:799 evict+0x4ae/0x930 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x638/0x7c0 fs/inode.c:1762 dentry_unlink_inode+0x2cf/0x380 fs/dcache.c:378 __dentry_kill+0x44f/0x650 fs/dcache.c:583 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x42/0x80 fs/dcache.c:883 __fput+0x4fe/0x770 fs/file_table.c:294 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f8049c1a819 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:00007f8048675028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: fffffffffffffffb RBX: 00007f8049e93fa0 RCX: 00007f8049c1a819 RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000200000000000 RBP: 00007f8049cb0c91 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8049e94038 R14: 00007f8049e93fa0 R15: 00007ffcf8526468 Modules linked in: ---[ end trace f7e086f9516593b5 ]--- RIP: 0010:f2fs_test_and_clear_bit fs/f2fs/f2fs.h:2924 [inline] RIP: 0010:update_sit_entry+0x5f7/0xf50 fs/f2fs/segment.c:2382 Code: 00 00 49 8d 5d 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 d7 1a 92 ff 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 5c 08 00 00 44 0f b6 33 0f b6 45 bf 44 RSP: 0018:ffffc900011af350 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff8881280562c0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900011af3d0 R08: ffff8881269b607f R09: 1ffff11024d36c0f R10: dffffc0000000000 R11: ffffed1024d36c10 R12: dffffc0000000000 R13: ffff88811d3a4078 R14: ffff8881269b60c0 R15: ffff8881269b6000 FS: 00007f80486756c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f052747ef00 CR3: 000000010f78f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 49 8d 5d 18 lea 0x18(%r13),%rbx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 d7 1a 92 ff call 0xff921af3 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 03 5d a8 add -0x58(%rbp),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 5c 08 00 00 jne 0x893 37: 44 0f b6 33 movzbl (%rbx),%r14d 3b: 0f b6 45 bf movzbl -0x41(%rbp),%eax 3f: 44 rex.R