jfs_dirty_inode called on read-only volume Is remount racy? jfs_dirty_inode called on read-only volume Is remount racy? general protection fault, probably for non-canonical address 0xdffffc00000000c6: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000630-0x0000000000000637] CPU: 1 PID: 6034 Comm: syz.1.43 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline] RIP: 0010:txEnd+0xb4/0x520 fs/jfs/jfs_txnmgr.c:507 Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 bc 07 dc fe 41 bf 30 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 9d 07 dc fe 49 8b 1f 48 83 c3 30 RSP: 0018:ffffc90004e0f740 EFLAGS: 00010206 RAX: 00000000000000c6 RBX: ffffc90002689020 RCX: 1ffff920009c1ecc RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 00000000ffffffff RBP: ffffc90004e0f9b0 R08: ffffffff90d9454f R09: 1ffffffff21b28a9 R10: dffffc0000000000 R11: fffffbfff21b28aa R12: ffff88805e4b6eb0 R13: dffffc0000000000 R14: ffffc90002689000 R15: 0000000000000630 FS: 00007f5157d726c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2dedf3 CR3: 000000005eba5000 CR4: 00000000003506e0 Call Trace: jfs_create+0x331/0xa40 fs/jfs/namei.c:159 lookup_open fs/namei.c:3496 [inline] open_last_lookups fs/namei.c:3564 [inline] path_openat+0x1277/0x3190 fs/namei.c:3794 do_filp_open+0x1c5/0x3d0 fs/namei.c:3824 do_sys_openat2+0x12c/0x1c0 fs/open.c:1421 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1447 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5156f8f749 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:00007f5157d72038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f51571e5fa0 RCX: 00007f5156f8f749 RDX: 00000000001a10c1 RSI: 0000200000000140 RDI: ffffffffffffff9c RBP: 00007f5157013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 9c37611dc13d0d83 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f51571e6038 R14: 00007f51571e5fa0 R15: 00007ffd384d46a8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline] RIP: 0010:txEnd+0xb4/0x520 fs/jfs/jfs_txnmgr.c:507 Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 bc 07 dc fe 41 bf 30 06 00 00 4c 03 3b 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 9d 07 dc fe 49 8b 1f 48 83 c3 30 RSP: 0018:ffffc90004e0f740 EFLAGS: 00010206 RAX: 00000000000000c6 RBX: ffffc90002689020 RCX: 1ffff920009c1ecc RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: 00000000ffffffff RBP: ffffc90004e0f9b0 R08: ffffffff90d9454f R09: 1ffffffff21b28a9 R10: dffffc0000000000 R11: fffffbfff21b28aa R12: ffff88805e4b6eb0 R13: dffffc0000000000 R14: ffffc90002689000 R15: 0000000000000630 FS: 00007f5157d726c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2dedf3 CR3: 000000005eba5000 CR4: 00000000003506e0 ---------------- Code disassembly (best guess): 0: 49 8d 5e 20 lea 0x20(%r14),%rbx 4: 48 89 d8 mov %rbx,%rax 7: 48 c1 e8 03 shr $0x3,%rax b: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 10: 74 08 je 0x1a 12: 48 89 df mov %rbx,%rdi 15: e8 bc 07 dc fe call 0xfedc07d6 1a: 41 bf 30 06 00 00 mov $0x630,%r15d 20: 4c 03 3b add (%rbx),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 9d 07 dc fe call 0xfedc07d6 39: 49 8b 1f mov (%r15),%rbx 3c: 48 83 c3 30 add $0x30,%rbx