syz.2.16: attempt to access beyond end of device loop2: rw=2049, sector=45224, nr_sectors = 128 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: 0 PID: 450 Comm: syz.2.16 Not tainted 6.1.141-syzkaller-1169943-g7011769d221c #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:2941 [inline] RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2396 [inline] RIP: 0010:update_sit_entry+0x4f9/0x15a0 fs/f2fs/segment.c:2440 Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 7e 0a 8d ff 48 8b 1b 4c 01 f3 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 55 0f 00 00 44 0f b6 23 44 89 e0 44 08 f8 RSP: 0018:ffffc90000a264e0 EFLAGS: 00010247 RAX: 0000000000000000 RBX: 0000000000000004 RCX: dffffc0000000000 RDX: ffff88811c09a880 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000a265b0 R08: ffff88811c09a880 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: ffff88811cf340c8 R14: 0000000000000004 R15: 0000000000000004 FS: 00007fcc173b86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcc17396f98 CR3: 000000012cd51000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x148c/0x3af0 fs/f2fs/segment.c:3430 do_write_page+0x297/0xc40 fs/f2fs/segment.c:3532 f2fs_outplace_write_data+0x14f/0x2d0 fs/f2fs/segment.c:3605 f2fs_do_write_data_page+0x105f/0x14a0 fs/f2fs/data.c:2796 f2fs_write_single_data_page+0x949/0x17f0 fs/f2fs/data.c:2913 f2fs_write_cache_pages fs/f2fs/data.c:3165 [inline] __f2fs_write_data_pages fs/f2fs/data.c:3315 [inline] f2fs_write_data_pages+0x1405/0x28b0 fs/f2fs/data.c:3342 do_writepages+0x3a9/0x5e0 mm/page-writeback.c:2494 filemap_fdatawrite_wbc+0x128/0x190 mm/filemap.c:408 __filemap_fdatawrite_range mm/filemap.c:441 [inline] filemap_write_and_wait_range+0x10b/0x1d0 mm/filemap.c:694 f2fs_flush_buffered_write fs/f2fs/file.c:4756 [inline] f2fs_file_write_iter+0x798/0x2550 fs/f2fs/file.c:4964 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x650/0xb10 fs/read_write.c:861 vfs_iter_write+0x7d/0xa0 fs/read_write.c:902 iter_file_splice_write+0x662/0xc50 fs/splice.c:685 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0xf7/0x130 fs/splice.c:930 splice_direct_to_actor+0x4a2/0xb10 fs/splice.c:885 do_splice_direct+0x1b3/0x2c0 fs/splice.c:973 do_sendfile+0x5c6/0xeb0 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x18f/0x1f0 fs/read_write.c:1309 x64_sys_call+0x62c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fcc1658e929 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:00007fcc173b8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fcc167b5fa0 RCX: 00007fcc1658e929 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005 RBP: 00007fcc16610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000fffe80 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fcc167b5fa0 R15: 00007ffff53208c8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2941 [inline] RIP: 0010:update_sit_entry_for_alloc fs/f2fs/segment.c:2396 [inline] RIP: 0010:update_sit_entry+0x4f9/0x15a0 fs/f2fs/segment.c:2440 Code: 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 7e 0a 8d ff 48 8b 1b 4c 01 f3 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 0f 85 55 0f 00 00 44 0f b6 23 44 89 e0 44 08 f8 RSP: 0018:ffffc90000a264e0 EFLAGS: 00010247 RAX: 0000000000000000 RBX: 0000000000000004 RCX: dffffc0000000000 RDX: ffff88811c09a880 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000a265b0 R08: ffff88811c09a880 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: ffff88811cf340c8 R14: 0000000000000004 R15: 0000000000000004 FS: 00007fcc173b86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcc17396f98 CR3: 000000012cd51000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 5 bytes skipped: 0: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 4: 74 08 je 0xe 6: 48 89 df mov %rbx,%rdi 9: e8 7e 0a 8d ff call 0xff8d0a8c e: 48 8b 1b mov (%rbx),%rbx 11: 4c 01 f3 add %r14,%rbx 14: 48 89 d8 mov %rbx,%rax 17: 48 c1 e8 03 shr $0x3,%rax 1b: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 22: fc ff df * 25: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 29: 84 c0 test %al,%al 2b: 0f 85 55 0f 00 00 jne 0xf86 31: 44 0f b6 23 movzbl (%rbx),%r12d 35: 44 89 e0 mov %r12d,%eax 38: 44 08 f8 or %r15b,%al