general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 PID: 3638 Comm: syz-executor421 Not tainted 6.1.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:lmLogSync+0x227/0xb00 fs/jfs/jfs_logmgr.c:937 Code: ae fe 49 8d 5f f0 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 37 21 d7 fe 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 1a 21 d7 fe 48 8b 3b e8 a2 fb ae RSP: 0018:ffffc90003c6fa60 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: 1a1064e09ad07200 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003c6fb68 R08: ffffffff81b68453 R09: ffffc90003c6f9b0 R10: fffff5200078df39 R11: 1ffff9200078df36 R12: dffffc0000000000 R13: ffff888078d2a800 R14: 0000000000000000 R15: ffff888013711a38 FS: 0000555556c7b300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556c84628 CR3: 000000007e614000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: jfs_syncpt+0x79/0x90 fs/jfs/jfs_logmgr.c:1041 jfs_sync_fs+0x86/0xa0 fs/jfs/super.c:685 sync_filesystem+0xe8/0x220 fs/sync.c:56 generic_shutdown_super+0x6b/0x310 fs/super.c:474 kill_block_super+0x79/0xd0 fs/super.c:1428 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 cleanup_mnt+0x494/0x520 fs/namespace.c:1186 task_work_run+0x243/0x300 kernel/task_work.c:179 ptrace_notify+0x29a/0x340 kernel/signal.c:2354 ptrace_report_syscall include/linux/ptrace.h:420 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline] syscall_exit_work+0x8c/0xe0 kernel/entry/common.c:251 syscall_exit_to_user_mode_prepare+0x63/0xc0 kernel/entry/common.c:278 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0xa/0x60 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff13bf59e57 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 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe9a14f168 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff13bf59e57 RDX: 00007ffe9a14f229 RSI: 000000000000000a RDI: 00007ffe9a14f220 RBP: 00007ffe9a14f220 R08: 00000000ffffffff R09: 00007ffe9a14f000 R10: 0000555556c7c653 R11: 0000000000000202 R12: 00007ffe9a150290 R13: 0000555556c7c5f0 R14: 00007ffe9a14f190 R15: 0000000000000001 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:lmLogSync+0x227/0xb00 fs/jfs/jfs_logmgr.c:937 Code: ae fe 49 8d 5f f0 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 37 21 d7 fe 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 1a 21 d7 fe 48 8b 3b e8 a2 fb ae RSP: 0018:ffffc90003c6fa60 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: 1a1064e09ad07200 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003c6fb68 R08: ffffffff81b68453 R09: ffffc90003c6f9b0 R10: fffff5200078df39 R11: 1ffff9200078df36 R12: dffffc0000000000 R13: ffff888078d2a800 R14: 0000000000000000 R15: ffff888013711a38 FS: 0000555556c7b300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe9a150238 CR3: 000000007e614000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: ae scas %es:(%rdi),%al 1: fe 49 8d decb -0x73(%rcx) 4: 5f pop %rdi 5: f0 48 89 d8 lock mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 37 21 d7 fe callq 0xfed72153 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 30 add $0x30,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 1a 21 d7 fe callq 0xfed72153 39: 48 8b 3b mov (%rbx),%rdi 3c: e8 .byte 0xe8 3d: a2 .byte 0xa2 3e: fb sti 3f: ae scas %es:(%rdi),%al