Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 UID: 0 PID: 6602 Comm: syz-executor Not tainted 6.16.0-rc3-syzkaller-00190-g67a993863163 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:lmLogSync+0x22e/0x9d0 fs/jfs/jfs_logmgr.c:937 Code: 95 b5 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 d0 54 e2 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 b4 54 e2 fe 49 8b 3f e8 fc 94 b5 fe RSP: 0000:ffffc90003507ba0 EFLAGS: 00010206 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88807a650000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003507ca8 R08: ffffc90003507aff R09: 0000000000000000 R10: ffffc90003507988 R11: fffff520006a0f60 R12: ffff88807bf74000 R13: dffffc0000000000 R14: ffff88805e8bd838 R15: 0000000000000030 FS: 000055555f4a8500(0000) GS:ffff88812674f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5fa82d9000 CR3: 0000000033250000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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 generic_shutdown_super+0x6f/0x2c0 fs/super.c:622 kill_block_super+0x44/0x90 fs/super.c:1755 deactivate_locked_super+0xbc/0x110 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x217/0x300 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fc79158fc57 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffcb953dd08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fc791610925 RCX: 00007fc79158fc57 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcb953ddc0 RBP: 00007ffcb953ddc0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffcb953ee50 R13: 00007fc791610925 R14: 00000000000233c4 R15: 00007ffcb953ee90 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: 95 b5 fe 4d 8d 7e f0 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 d0 54 e2 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 b4 54 e2 fe 49 8b 3f e8 fc 94 b5 fe RSP: 0000:ffffc90003507ba0 EFLAGS: 00010206 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88807a650000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003507ca8 R08: ffffc90003507aff R09: 0000000000000000 R10: ffffc90003507988 R11: fffff520006a0f60 R12: ffff88807bf74000 R13: dffffc0000000000 R14: ffff88805e8bd838 R15: 0000000000000030 FS: 000055555f4a8500(0000) GS:ffff88812664f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd147b227d0 CR3: 0000000033250000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 95 xchg %eax,%ebp 1: b5 fe mov $0xfe,%ch 3: 4d 8d 7e f0 lea -0x10(%r14),%r15 7: 4c 89 f8 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 d0 54 e2 fe call 0xfee254ec 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 b4 54 e2 fe call 0xfee254ec 38: 49 8b 3f mov (%r15),%rdi 3b: e8 fc 94 b5 fe call 0xfeb5953c