loop0: detected capacity change from 0 to 32768 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 UID: 0 PID: 6203 Comm: syz.0.50 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207 Code: df e8 43 24 68 fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 c0 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 da 00 00 00 49 8b 7d 30 2e e8 bb 24 23 08 48 8d RSP: 0018:ffffc90004f27af8 EFLAGS: 00010216 RAX: 0000000000000006 RBX: ffff88807f450600 RCX: ffffc9000c73a000 RDX: 0000000000080000 RSI: ffffffff8356c40d RDI: 0000000000000030 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88807f1166b0 R12: ffffffff81f67160 R13: 0000000000000000 R14: ffff88807b631800 R15: ffff8880537d8f80 FS: 00007f6304bf46c0(0000) GS:ffff8881249f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31504ff8 CR3: 0000000076c0a000 CR4: 0000000000350ef0 Call Trace: lmLogSync+0x49e/0x820 fs/jfs/jfs_logmgr.c:937 jfs_syncpt+0x89/0xa0 fs/jfs/jfs_logmgr.c:1041 jfs_sync_fs+0x83/0xb0 fs/jfs/super.c:650 sync_filesystem fs/sync.c:56 [inline] sync_filesystem+0x111/0x290 fs/sync.c:30 jfs_reconfigure+0xf8/0xb90 fs/jfs/super.c:370 reconfigure_super+0x450/0xb60 fs/super.c:1077 do_remount fs/namespace.c:3264 [inline] path_mount+0x1a4c/0x23a0 fs/namespace.c:4014 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount fs/namespace.c:4201 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6303d90eea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f6304bf3e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6304bf3ef0 RCX: 00007f6303d90eea RDX: 0000200000000580 RSI: 0000200000000f00 RDI: 0000000000000000 RBP: 0000200000000580 R08: 00007f6304bf3ef0 R09: 0000000001a4a438 R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000200000000f00 R13: 00007f6304bf3eb0 R14: 0000000000000000 R15: 00002000000008c0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:write_special_inodes+0x71/0x170 fs/jfs/jfs_logmgr.c:207 Code: df e8 43 24 68 fe 48 8d 7b 10 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 c0 00 00 00 4c 8b 6b 10 49 8d 7d 30 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 da 00 00 00 49 8b 7d 30 2e e8 bb 24 23 08 48 8d RSP: 0018:ffffc90004f27af8 EFLAGS: 00010216 RAX: 0000000000000006 RBX: ffff88807f450600 RCX: ffffc9000c73a000 RDX: 0000000000080000 RSI: ffffffff8356c40d RDI: 0000000000000030 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88807f1166b0 R12: ffffffff81f67160 R13: 0000000000000000 R14: ffff88807b631800 R15: ffff8880537d8f80 FS: 00007f6304bf46c0(0000) GS:ffff8881249f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31504ff8 CR3: 0000000076c0a000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: df e8 fucomip %st(0),%st 2: 43 24 68 rex.XB and $0x68,%al 5: fe 48 8d decb -0x73(%rax) 8: 7b 10 jnp 0x1a a: 48 89 f8 mov %rdi,%rax d: 48 c1 e8 03 shr $0x3,%rax 11: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 15: 0f 85 c0 00 00 00 jne 0xdb 1b: 4c 8b 6b 10 mov 0x10(%rbx),%r13 1f: 49 8d 7d 30 lea 0x30(%r13),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction 2e: 0f 85 da 00 00 00 jne 0x10e 34: 49 8b 7d 30 mov 0x30(%r13),%rdi 38: 2e e8 bb 24 23 08 cs call 0x82324f9 3e: 48 rex.W 3f: 8d .byte 0x8d