general protection fault, probably for non-canonical address 0xdffffc00000000ba: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000005d0-0x00000000000005d7] CPU: 0 PID: 4168 Comm: syz-executor Not tainted 5.15.185-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1842 [inline] RIP: 0010:bio_associate_blkg_from_css+0x2ab/0x9c0 block/blk-cgroup.c:1876 Code: ff df 80 3c 08 00 74 08 48 89 df e8 ef 57 f3 fd 41 be d0 05 00 00 4c 03 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 c7 57 f3 fd bb 90 00 00 00 49 03 1e RSP: 0018:ffffc90002dffa80 EFLAGS: 00010202 RAX: 00000000000000ba RBX: ffff888065be7008 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8a59a720 RDI: ffffffff8a59a6e0 RBP: 1ffff1100cb7ce09 R08: dffffc0000000000 R09: fffffbfff1ff3619 R10: fffffbfff1ff3619 R11: 1ffffffff1ff3618 R12: ffff88814c67a110 R13: ffff888065be7048 R14: 00000000000005d0 R15: ffff88807beabbac FS: 0000555574dd4500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f51116e8000 CR3: 000000006249d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bio_associate_blkg+0x23a/0x340 block/blk-cgroup.c:1904 lbmStartIO+0x204/0x4c0 fs/jfs/jfs_logmgr.c:2130 lbmWrite+0x361/0x480 fs/jfs/jfs_logmgr.c:2079 lmGCwrite fs/jfs/jfs_logmgr.c:-1 [inline] jfs_flush_journal+0x535/0xeb0 fs/jfs/jfs_logmgr.c:1556 jfs_sync_fs+0x79/0xa0 fs/jfs/super.c:689 sync_filesystem+0xe6/0x220 fs/sync.c:56 generic_shutdown_super+0x6b/0x300 fs/super.c:448 kill_block_super+0x7c/0xe0 fs/super.c:1427 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1139 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fde83902c57 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:00007fffd2b678c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fde83983925 RCX: 00007fde83902c57 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffd2b67980 RBP: 00007fffd2b67980 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffd2b68a10 R13: 00007fde83983925 R14: 0000000000014cf6 R15: 00007fffd2b68a50 Modules linked in: ---[ end trace 67f170fe3a161248 ]--- RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1842 [inline] RIP: 0010:bio_associate_blkg_from_css+0x2ab/0x9c0 block/blk-cgroup.c:1876 Code: ff df 80 3c 08 00 74 08 48 89 df e8 ef 57 f3 fd 41 be d0 05 00 00 4c 03 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 c7 57 f3 fd bb 90 00 00 00 49 03 1e RSP: 0018:ffffc90002dffa80 EFLAGS: 00010202 RAX: 00000000000000ba RBX: ffff888065be7008 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff8a59a720 RDI: ffffffff8a59a6e0 RBP: 1ffff1100cb7ce09 R08: dffffc0000000000 R09: fffffbfff1ff3619 R10: fffffbfff1ff3619 R11: 1ffffffff1ff3618 R12: ffff88814c67a110 R13: ffff888065be7048 R14: 00000000000005d0 R15: ffff88807beabbac FS: 0000555574dd4500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f14623d7178 CR3: 000000006249d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: df 80 3c 08 00 74 filds 0x7400083c(%rax) 6: 08 48 89 or %cl,-0x77(%rax) 9: df e8 fucomip %st(0),%st b: ef out %eax,(%dx) c: 57 push %rdi d: f3 fd repz std f: 41 be d0 05 00 00 mov $0x5d0,%r14d 15: 4c 03 33 add (%rbx),%r14 18: 4c 89 f0 mov %r14,%rax 1b: 48 c1 e8 03 shr $0x3,%rax 1f: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 26: fc ff df * 29: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2d: 74 08 je 0x37 2f: 4c 89 f7 mov %r14,%rdi 32: e8 c7 57 f3 fd call 0xfdf357fe 37: bb 90 00 00 00 mov $0x90,%ebx 3c: 49 03 1e add (%r14),%rbx