syz.3.2952: attempt to access beyond end of device loop3: rw=2049, sector=53248, nr_sectors = 8 limit=40427 syz.3.2952: attempt to access beyond end of device loop3: rw=2049, sector=53264, nr_sectors = 24 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: 11770 Comm: syz.3.2952 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2952 [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 e3 8c 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:ffffc9000120e880 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88811f196540 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000120e950 R08: ffff88811f196540 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000000000 R13: ffff8881158e00c8 R14: 0000000000000000 R15: 0000000000000080 FS: 00007f8ce39986c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000013324c000 CR4: 00000000003506b0 DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081 DR3: ffffffffefffff15 DR6: 00000000ffff4ff0 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:2797 f2fs_write_single_data_page+0x949/0x17f0 fs/f2fs/data.c:2914 f2fs_write_cache_pages fs/f2fs/data.c:3166 [inline] __f2fs_write_data_pages fs/f2fs/data.c:3316 [inline] f2fs_write_data_pages+0x1405/0x28b0 fs/f2fs/data.c:3343 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] file_write_and_wait_range+0x137/0x200 mm/filemap.c:794 f2fs_do_sync_file+0x3d0/0x1d00 fs/f2fs/file.c:275 f2fs_sync_file+0x103/0x150 fs/f2fs/file.c:393 vfs_fsync_range+0x1a1/0x1b0 fs/sync.c:188 generic_write_sync include/linux/fs.h:2980 [inline] f2fs_file_write_iter+0x6a2/0x2550 fs/f2fs/file.c:4970 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5db/0xca0 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __x64_sys_pwrite64+0x191/0x220 fs/read_write.c:706 x64_sys_call+0x36/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:19 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: 0033:0x7f8ce2b8f749 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:00007f8ce3998038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f8ce2de5fa0 RCX: 00007f8ce2b8f749 RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000004 RBP: 00007f8ce2c13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8ce2de6038 R14: 00007f8ce2de5fa0 R15: 00007ffe098eff88 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f2fs_test_and_set_bit fs/f2fs/f2fs.h:2952 [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 e3 8c 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:ffffc9000120e880 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88811f196540 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000120e950 R08: ffff88811f196540 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000000000 R13: ffff8881158e00c8 R14: 0000000000000000 R15: 0000000000000080 FS: 00007f8ce39986c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff33cdb7198 CR3: 000000013324c000 CR4: 00000000003506b0 DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081 DR3: ffffffffefffff15 DR6: 00000000ffff4ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: df 80 3c 08 00 74 filds 0x7400083c(%rax) 6: 08 48 89 or %cl,-0x77(%rax) 9: df e8 fucomip %st(0),%st b: 7e e3 jle 0xfffffff0 d: 8c ff mov %?,%edi f: 48 8b 1b mov (%rbx),%rbx 12: 4c 01 f3 add %r14,%rbx 15: 48 89 d8 mov %rbx,%rax 18: 48 c1 e8 03 shr $0x3,%rax 1c: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 23: fc ff df * 26: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2a: 84 c0 test %al,%al 2c: 0f 85 55 0f 00 00 jne 0xf87 32: 44 0f b6 23 movzbl (%rbx),%r12d 36: 44 89 e0 mov %r12d,%eax 39: 44 08 f8 or %r15b,%al