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: 7039 Comm: syz-executor.2 Not tainted 6.1.92-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:jfs_flush_journal+0x997/0xec0 fs/jfs/jfs_logmgr.c:1582 Code: ad fe 49 8d 5f f0 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 47 b2 d8 fe 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 4c 8b 74 24 38 74 08 48 89 df e8 25 b2 d8 fe 48 8b RSP: 0018:ffffc900050379a0 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: 40d73d5ca2fa7700 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90005037ad8 R08: ffffffff81b6fd16 R09: ffffc900050378f0 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000002 R13: dffffc0000000000 R14: ffff88804fd88da0 R15: ffff88807dca6038 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c333000 CR3: 000000000ce8e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: jfs_umount+0xf4/0x370 fs/jfs/jfs_umount.c:58 jfs_put_super+0x86/0x180 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_block_super+0x7a/0xe0 fs/super.c:1459 deactivate_locked_super+0xa0/0x110 fs/super.c:332 cleanup_mnt+0x490/0x520 fs/namespace.c:1186 task_work_run+0x246/0x300 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa73/0x26a0 kernel/exit.c:869 do_group_exit+0x202/0x2b0 kernel/exit.c:1019 __do_sys_exit_group kernel/exit.c:1030 [inline] __se_sys_exit_group kernel/exit.c:1028 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1028 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f311da7cee9 Code: Unable to access opcode bytes at 0x7f311da7cebf. RSP: 002b:00007ffe5c1c10c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f311dac835b RCX: 00007f311da7cee9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000005 R08: 00007ffe5c1bee67 R09: 00007ffe5c1c2380 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe5c1c2380 R13: 00007f311dac8336 R14: 0000000000048784 R15: 0000000000000006 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:write_special_inodes fs/jfs/jfs_logmgr.c:208 [inline] RIP: 0010:jfs_flush_journal+0x997/0xec0 fs/jfs/jfs_logmgr.c:1582 Code: ad fe 49 8d 5f f0 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 47 b2 d8 fe 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 4c 8b 74 24 38 74 08 48 89 df e8 25 b2 d8 fe 48 8b RSP: 0018:ffffc900050379a0 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000030 RCX: 40d73d5ca2fa7700 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90005037ad8 R08: ffffffff81b6fd16 R09: ffffc900050378f0 ---------------- Code disassembly (best guess): 0: ad lods %ds:(%rsi),%eax 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 28 00 cmpb $0x0,(%rax,%r13,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 47 b2 d8 fe call 0xfed8b263 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 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 4c 8b 74 24 38 mov 0x38(%rsp),%r14 34: 74 08 je 0x3e 36: 48 89 df mov %rbx,%rdi 39: e8 25 b2 d8 fe call 0xfed8b263 3e: 48 rex.W 3f: 8b .byte 0x8b