loop1: 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: 9027 Comm: syz.1.743 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 fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:lmLogSync+0x22e/0x9d0 fs/jfs/jfs_logmgr.c:937 Code: 1a b1 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 70 2c df fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 54 2c df fe 49 8b 3f e8 2c 1a b1 fe RSP: 0018:ffffc9001e797ae0 EFLAGS: 00010216 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc900047b1000 RSI: 0000000000000862 RDI: 0000000000000863 RBP: ffffc9001e797bf8 R08: ffffc9001e797a2f R09: ffffc9001e7978c8 R10: dffffc0000000000 R11: fffff52003cf2f46 R12: ffff8880775a7800 R13: dffffc0000000000 R14: ffff888031b42238 R15: 0000000000000030 FS: 00007fe84274f6c0(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000073442000 CR4: 0000000000350ef0 Call Trace: jfs_syncpt+0x7b/0x90 fs/jfs/jfs_logmgr.c:1041 jfs_sync_fs+0x87/0xa0 fs/jfs/super.c:650 sync_filesystem+0xee/0x230 fs/sync.c:56 jfs_reconfigure+0xc6/0xa00 fs/jfs/super.c:370 reconfigure_super+0x227/0x890 fs/super.c:1076 do_remount fs/namespace.c:3270 [inline] path_mount+0xd1a/0xfe0 fs/namespace.c:4020 do_mount fs/namespace.c:4041 [inline] __do_sys_mount fs/namespace.c:4229 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4206 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe841990eea 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:00007fe84274ee68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe84274eef0 RCX: 00007fe841990eea RDX: 0000200000000580 RSI: 0000200000000f00 RDI: 0000000000000000 RBP: 0000200000000580 R08: 00007fe84274eef0 R09: 0000000001a4a438 R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000200000000f00 R13: 00007fe84274eeb0 R14: 0000000000000000 R15: 00002000000008c0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:lmLogSync+0x22e/0x9d0 fs/jfs/jfs_logmgr.c:937 Code: 1a b1 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 70 2c df fe 4d 8b 3f 49 83 c7 30 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 54 2c df fe 49 8b 3f e8 2c 1a b1 fe RSP: 0018:ffffc9001e797ae0 EFLAGS: 00010216 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc900047b1000 RSI: 0000000000000862 RDI: 0000000000000863 RBP: ffffc9001e797bf8 R08: ffffc9001e797a2f R09: ffffc9001e7978c8 R10: dffffc0000000000 R11: fffff52003cf2f46 R12: ffff8880775a7800 R13: dffffc0000000000 R14: ffff888031b42238 R15: 0000000000000030 FS: 00007fe84274f6c0(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000073442000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 1a b1 fe 4d 8d 7e sbb 0x7e8d4dfe(%rcx),%dh 6: f0 4c 89 f8 lock mov %r15,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 12: 74 08 je 0x1c 14: 4c 89 ff mov %r15,%rdi 17: e8 70 2c df fe call 0xfedf2c8c 1c: 4d 8b 3f mov (%r15),%r15 1f: 49 83 c7 30 add $0x30,%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 54 2c df fe call 0xfedf2c8c 38: 49 8b 3f mov (%r15),%rdi 3b: e8 2c 1a b1 fe call 0xfeb11a6c