attempt to access beyond end of device loop4: rw=2049, want=65536, limit=40427 attempt to access beyond end of device loop4: rw=2049, want=77824, limit=40427 general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 PID: 3466 Comm: syz.4.900 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2912 [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 d0 15 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 ab 08 00 00 44 0f b6 33 44 89 f0 44 8b RSP: 0018:ffffc90001006e90 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 000000000000001a RCX: 0000000000000002 RDX: ffff88811db18000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001006f10 R08: ffff88811db18000 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000 R13: ffff888106982208 R14: ffff8881262320c0 R15: ffff888126232000 FS: 00007f70c137b6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5c6c77f0d7 CR3: 0000000115bf6000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x159c/0x3a20 fs/f2fs/segment.c:3481 do_write_page+0x2d9/0x820 fs/f2fs/segment.c:3569 f2fs_outplace_write_data+0xf6/0x240 fs/f2fs/segment.c:3635 f2fs_do_write_data_page+0xad4/0x11c0 fs/f2fs/data.c:2716 f2fs_write_single_data_page+0xa10/0x16e0 fs/f2fs/data.c:2839 f2fs_write_cache_pages fs/f2fs/data.c:3090 [inline] __f2fs_write_data_pages fs/f2fs/data.c:3240 [inline] f2fs_write_data_pages+0x1813/0x2950 fs/f2fs/data.c:3267 do_writepages+0x128/0x280 mm/page-writeback.c:2380 __filemap_fdatawrite_range+0x2a0/0x350 mm/filemap.c:427 filemap_write_and_wait_range+0x65/0x290 mm/filemap.c:660 f2fs_collapse_range+0x489/0x510 fs/f2fs/file.c:1466 f2fs_fallocate+0x497/0x7e0 fs/f2fs/file.c:1860 vfs_fallocate+0x4b4/0x590 fs/open.c:310 ksys_fallocate fs/open.c:333 [inline] __do_sys_fallocate fs/open.c:341 [inline] __se_sys_fallocate fs/open.c:339 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:339 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f70c2920e59 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:00007f70c137b028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f70c2b99fa0 RCX: 00007f70c2920e59 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000009 RBP: 00007f70c29b6d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000008000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f70c2b9a038 R14: 00007f70c2b99fa0 R15: 00007ffed75b2678 Modules linked in: ---[ end trace abd9680a9b72dec0 ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2912 [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 d0 15 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 ab 08 00 00 44 0f b6 33 44 89 f0 44 8b RSP: 0018:ffffc90001006e90 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 000000000000001a RCX: 0000000000000002 RDX: ffff88811db18000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001006f10 R08: ffff88811db18000 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000002 R12: dffffc0000000000 R13: ffff888106982208 R14: ffff8881262320c0 R15: ffff888126232000 FS: 00007f70c137b6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5c6c77f0d7 CR3: 0000000115bf6000 CR4: 00000000003526a0 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 d0 15 92 ff call 0xff9215ec 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