general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 PID: 495 Comm: syz.0.16 Not tainted 5.10.238-syzkaller-1007479-gd76d4cd0623a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2908 [inline] RIP: 0010:update_sit_entry+0x58e/0xf50 fs/f2fs/segment.c:2339 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 70 2a 94 ff 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ab 08 00 00 44 0f b6 33 44 89 f0 44 8b RSP: 0018:ffffc90000de7350 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 000000000000000c RCX: 0000000000000000 RDX: ffff888130330000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000de73d0 R08: ffff888130330000 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88811bc0aa08 R14: ffff88811acf60c0 R15: ffff88811acf6000 FS: 00007f1e1f7616c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556c8fe4a8 CR3: 000000011941e000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x156b/0x3a10 fs/f2fs/segment.c:3481 __allocate_data_block+0x52a/0x980 fs/f2fs/data.c:1407 f2fs_map_blocks+0xdc8/0x35c0 fs/f2fs/data.c:1575 expand_inode_data+0x5d7/0x930 fs/f2fs/file.c:1724 f2fs_fallocate+0x42b/0x7e0 fs/f2fs/file.c:1825 vfs_fallocate+0x4b4/0x590 fs/open.c:310 ioctl_preallocate fs/ioctl.c:494 [inline] file_ioctl fs/ioctl.c:-1 [inline] do_vfs_ioctl+0x12e3/0x1510 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x9f/0x1a0 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f1e1fcef169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1e1f761038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1e1ff07fa0 RCX: 00007f1e1fcef169 RDX: 00004000000000c0 RSI: 0000000040305828 RDI: 0000000000000004 RBP: 00007f1e1fd702a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1e1ff07fa0 R15: 00007ffd04b84fd8 Modules linked in: ---[ end trace 7f559576a0eed5af ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2908 [inline] RIP: 0010:update_sit_entry+0x58e/0xf50 fs/f2fs/segment.c:2339 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 70 2a 94 ff 48 8b 1b 48 03 5d a8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 ab 08 00 00 44 0f b6 33 44 89 f0 44 8b RSP: 0018:ffffc90000de7350 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 000000000000000c RCX: 0000000000000000 RDX: ffff888130330000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000de73d0 R08: ffff888130330000 R09: 0000000000000003 ---------------- 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 70 2a 94 ff call 0xff942a8c 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 ab 08 00 00 jne 0x8e2 37: 44 0f b6 33 movzbl (%rbx),%r14d 3b: 44 89 f0 mov %r14d,%eax 3e: 44 rex.R 3f: 8b .byte 0x8b