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: 5820 Comm: syz-executor263 Not tainted 6.15.0-rc4-syzkaller-00021-gca91b9500108 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] RIP: 0010:lmLogSync+0x1f1/0x9d0 fs/jfs/jfs_logmgr.c:937 Code: dc 85 fe 4d 8d 7e d8 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 4d ab e5 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 31 ab e5 fe 49 8b 3f e8 49 1f bc fe RSP: 0018:ffffc90003f1fa40 EFLAGS: 00010206 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88802f7e3c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003f1fb48 R08: ffffc90003f1f99f R09: 0000000000000000 R10: ffffc90003f1f828 R11: fffff520007e3f34 R12: ffff8880562bf000 R13: dffffc0000000000 R14: ffff8880339c8638 R15: 0000000000000030 FS: 000055555907c380(0000) GS:ffff888126203000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555590856f8 CR3: 0000000027954000 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+0xeb/0x230 fs/sync.c:56 generic_shutdown_super+0x6f/0x2c0 fs/super.c:621 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xb9/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1435 task_work_run+0x1d1/0x260 kernel/task_work.c:227 ptrace_notify+0x281/0x2c0 kernel/signal.c:2520 ptrace_report_syscall include/linux/ptrace.h:415 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline] syscall_exit_work+0xc2/0x1d0 kernel/entry/common.c:173 syscall_exit_to_user_mode_prepare+0x6f/0xe0 kernel/entry/common.c:200 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline] syscall_exit_to_user_mode+0x12/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcb179c05f7 Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffd5fdfdc48 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fcb179c05f7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd5fdfdd00 RBP: 00007ffd5fdfdd00 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffd5fdfed70 R13: 000055555907d6c0 R14: 431bde82d7b634db R15: 00007ffd5fdfed90 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:207 [inline] RIP: 0010:lmLogSync+0x1f1/0x9d0 fs/jfs/jfs_logmgr.c:937 Code: dc 85 fe 4d 8d 7e d8 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 4d ab e5 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 31 ab e5 fe 49 8b 3f e8 49 1f bc fe RSP: 0018:ffffc90003f1fa40 EFLAGS: 00010206 RAX: 0000000000000006 RBX: dffffc0000000000 RCX: ffff88802f7e3c00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003f1fb48 R08: ffffc90003f1f99f R09: 0000000000000000 R10: ffffc90003f1f828 R11: fffff520007e3f34 R12: ffff8880562bf000 R13: dffffc0000000000 R14: ffff8880339c8638 R15: 0000000000000030 FS: 000055555907c380(0000) GS:ffff888126103000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055566848b9e8 CR3: 0000000027954000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: dc 85 fe 4d 8d 7e faddl 0x7e8d4dfe(%rbp) 6: d8 4c 89 f8 fmuls -0x8(%rcx,%rcx,4) 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 4d ab e5 fe call 0xfee5ab69 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 31 ab e5 fe call 0xfee5ab69 38: 49 8b 3f mov (%r15),%rdi 3b: e8 49 1f bc fe call 0xfebc1f89