BUG: kernel NULL pointer dereference, address: 0000000000000030 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 UID: 0 PID: 8218 Comm: syz-executor368 Not tainted 6.12.0-rc1 #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:write_special_inodes+0x38/0x70 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/jfs/jfs_logmgr.c:208 Code: 53 e8 6c 30 68 ff 49 8b 45 00 49 39 c5 74 43 48 8d 58 c8 e8 5a 30 68 ff 48 8b 43 10 48 8b 78 30 2e e8 4c 0d 39 03 48 8b 43 28 <48> 8b 78 30 2e e8 3e 0d 39 03 48 8b 83 b0 00 00 00 48 8b 78 30 2e RSP: 0018:ffff88800f2c3ce8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88800e279c00 RCX: ffffffff814acf4f RDX: ffff88800dde3300 RSI: ffffffff814acf5b RDI: 0000000000000005 RBP: ffff88800f2c3d00 R08: ffff88800a50e3d0 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff814b2420 R13: ffff888040fd5200 R14: ffff888040fd5280 R15: 0000000000000000 FS: 00005555717b43c0(0000) GS:ffff88807ee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000030 CR3: 000000000d8fa000 CR4: 0000000000350ef0 Call Trace: <TASK> lmLogSync+0x231/0x310 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/jfs/jfs_logmgr.c:937 jfs_syncpt+0x6d/0x70 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/jfs/jfs_logmgr.c:1041 jfs_sync_fs+0x51/0x70 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/jfs/super.c:685 sync_filesystem data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/sync.c:56 [inline] sync_filesystem+0x8d/0x140 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/sync.c:30 generic_shutdown_super+0x39/0x170 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/super.c:621 kill_block_super+0x22/0x50 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/super.c:1696 deactivate_locked_super+0x57/0x1a0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/super.c:473 deactivate_super+0x83/0xa0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/super.c:506 cleanup_mnt+0x17e/0x210 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/namespace.c:1373 __cleanup_mnt+0x1a/0x30 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/namespace.c:1380 task_work_run+0x9d/0xf0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/task_work.c:228 resume_user_mode_work data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x17f/0x190 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/kernel/entry/common.c:218 do_syscall_64+0xab/0x1d0 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f44ff534f8b Code: 08 00 48 83 c4 08 5b 5d c3 66 0f 1f 44 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 RSP: 002b:00007ffc50d9a3b8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 000000000000a5ee RCX: 00007f44ff534f8b RDX: 00007f44ff4e4e88 RSI: 0000000000000009 RDI: 00007ffc50d9a470 RBP: 00007ffc50d9a470 R08: 0000000000000000 R09: 00007ffc50d9a240 R10: 00005555717b57b3 R11: 0000000000000202 R12: 00007ffc50d9b500 R13: 00005555717b5770 R14: 00007ffc50d9a3d8 R15: 00007ffc50d9b560 </TASK> Modules linked in: CR2: 0000000000000030 ---[ end trace 0000000000000000 ]--- RIP: 0010:write_special_inodes+0x38/0x70 data/ghui/docker_data/linux_kernel/upstream/linux_v6.11/fs/jfs/jfs_logmgr.c:208 Code: 53 e8 6c 30 68 ff 49 8b 45 00 49 39 c5 74 43 48 8d 58 c8 e8 5a 30 68 ff 48 8b 43 10 48 8b 78 30 2e e8 4c 0d 39 03 48 8b 43 28 <48> 8b 78 30 2e e8 3e 0d 39 03 48 8b 83 b0 00 00 00 48 8b 78 30 2e RSP: 0018:ffff88800f2c3ce8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88800e279c00 RCX: ffffffff814acf4f RDX: ffff88800dde3300 RSI: ffffffff814acf5b RDI: 0000000000000005 RBP: ffff88800f2c3d00 R08: ffff88800a50e3d0 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff814b2420 R13: ffff888040fd5200 R14: ffff888040fd5280 R15: 0000000000000000 FS: 00005555717b43c0(0000) GS:ffff88807ee00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000030 CR3: 000000000d8fa000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 53 push %rbx 1: e8 6c 30 68 ff call 0xff683072 6: 49 8b 45 00 mov 0x0(%r13),%rax a: 49 39 c5 cmp %rax,%r13 d: 74 43 je 0x52 f: 48 8d 58 c8 lea -0x38(%rax),%rbx 13: e8 5a 30 68 ff call 0xff683072 18: 48 8b 43 10 mov 0x10(%rbx),%rax 1c: 48 8b 78 30 mov 0x30(%rax),%rdi 20: 2e e8 4c 0d 39 03 cs call 0x3390d72 26: 48 8b 43 28 mov 0x28(%rbx),%rax * 2a: 48 8b 78 30 mov 0x30(%rax),%rdi <-- trapping instruction 2e: 2e e8 3e 0d 39 03 cs call 0x3390d72 34: 48 8b 83 b0 00 00 00 mov 0xb0(%rbx),%rax 3b: 48 8b 78 30 mov 0x30(%rax),%rdi 3f: 2e cs