ERROR: (device loop6): txBegin: read-only filesystem ERROR: (device loop6): remounting filesystem as read-only jfs_dirty_inode called on read-only volume Is remount racy? jfs_dirty_inode called on read-only volume Is remount racy? Oops: general protection fault, probably for non-canonical address 0xdffffc00000000cf: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000678-0x000000000000067f] CPU: 0 UID: 0 PID: 9948 Comm: syz.6.798 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026 RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline] RIP: 0010:txEnd+0xb4/0x530 fs/jfs/jfs_txnmgr.c:508 Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 bc 1d c5 fe 41 bf 78 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 1d c5 fe 49 8b 1f 48 83 c3 30 RSP: 0018:ffffc90006807b00 EFLAGS: 00010216 RAX: 00000000000000cf RBX: ffffc90002648020 RCX: ffffffff9a9ee501 RDX: 0000000000000001 RSI: ffffffff8e4172d0 RDI: 00000000ffffffff RBP: ffffc90006807d68 R08: ffffffff907a657f R09: 1ffffffff20f4caf R10: dffffc0000000000 R11: fffffbfff20f4cb0 R12: 1ffff92000d00f70 R13: dffffc0000000000 R14: ffffc90002648000 R15: 0000000000000678 FS: 00007f100eb236c0(0000) GS:ffff888124cc6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b34906000 CR3: 000000005697c000 CR4: 0000000000350ef0 Call Trace: jfs_mknod+0x323/0x9d0 fs/jfs/namei.c:1433 vfs_mknod+0x441/0x600 fs/namei.c:5269 filename_mknodat+0x3cb/0x660 fs/namei.c:-1 __do_sys_mknodat fs/namei.c:5350 [inline] __se_sys_mknodat+0x3b/0x150 fs/namei.c:5346 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f100db9e199 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:00007f100eb23028 EFLAGS: 00000246 ORIG_RAX: 0000000000000103 RAX: ffffffffffffffda RBX: 00007f100de26090 RCX: 00007f100db9e199 RDX: 00000000000061c0 RSI: 0000200000000180 RDI: ffffffffffffff9c RBP: 00007f100dc358e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f100de26128 R14: 00007f100de26090 R15: 00007fff506b62c8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:JFS_SBI fs/jfs/jfs_incore.h:217 [inline] RIP: 0010:txEnd+0xb4/0x530 fs/jfs/jfs_txnmgr.c:508 Code: 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 bc 1d c5 fe 41 bf 78 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 1d c5 fe 49 8b 1f 48 83 c3 30 RSP: 0018:ffffc90006807b00 EFLAGS: 00010216 RAX: 00000000000000cf RBX: ffffc90002648020 RCX: ffffffff9a9ee501 RDX: 0000000000000001 RSI: ffffffff8e4172d0 RDI: 00000000ffffffff RBP: ffffc90006807d68 R08: ffffffff907a657f R09: 1ffffffff20f4caf R10: dffffc0000000000 R11: fffffbfff20f4cb0 R12: 1ffff92000d00f70 R13: dffffc0000000000 R14: ffffc90002648000 R15: 0000000000000678 FS: 00007f100eb236c0(0000) GS:ffff888124cc6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b34906000 CR3: 000000005697c000 CR4: 0000000000350ef0 ---------------- 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 1d c5 fe call 0xfec51dd6 1a: 41 bf 78 06 00 00 mov $0x678,%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 1d c5 fe call 0xfec51dd6 39: 49 8b 1f mov (%r15),%rbx 3c: 48 83 c3 30 add $0x30,%rbx