9pnet: Found fid 0 not clunked Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 6436 Comm: syz.0.178 Not tainted 6.11.0-rc5-next-20240827-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:____rb_erase_color lib/rbtree.c:354 [inline] RIP: 0010:__rb_erase_color+0x2d7/0xa30 lib/rbtree.c:413 Code: 73 02 00 00 49 8d 5c 24 10 48 89 dd 48 c1 ed 03 42 80 7c 35 00 00 74 08 48 89 df e8 a3 6a 44 f6 4c 8b 2b 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 8a 6a 44 f6 41 f6 45 00 01 48 89 RSP: 0018:ffffc90002f4f040 EFLAGS: 00010046 RAX: 000000000016e360 RBX: ffff888140adbca0 RCX: dffffc0000000000 RDX: ffffffff81680de0 RSI: ffff8880b903ebc8 RDI: ffff888140adbc90 RBP: 1ffff1102815b794 R08: 000000000000013e R09: 1ffffffff20386c5 R10: dffffc0000000000 R11: ffffffff81671a60 R12: ffff888140adbc90 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fc7517736c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007facc2400210 CR3: 0000000027f36000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rb_erase_augmented include/linux/rbtree_augmented.h:331 [inline] rb_erase_augmented_cached include/linux/rbtree_augmented.h:340 [inline] __dequeue_entity+0x953/0xd30 kernel/sched/fair.c:863 set_next_entity+0xfe/0x4c0 kernel/sched/fair.c:5559 set_next_task_fair+0x1dd/0x540 kernel/sched/fair.c:13151 set_next_task kernel/sched/sched.h:2434 [inline] pick_next_task kernel/sched/core.c:6259 [inline] __schedule+0x4253/0x4b30 kernel/sched/core.c:6632 __schedule_loop kernel/sched/core.c:6754 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6769 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2559 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 __flush_work+0xa37/0xc50 kernel/workqueue.c:4216 kvfree_rcu_barrier+0x226/0x2d0 kernel/rcu/tree.c:3930 kmem_cache_destroy+0x2e/0x150 mm/slab_common.c:529 p9_client_destroy+0x5cc/0x660 net/9p/client.c:1078 v9fs_session_init+0x1600/0x1b80 fs/9p/v9fs.c:490 v9fs_mount+0xcf/0xaa0 fs/9p/vfs_super.c:122 legacy_get_tree+0xee/0x190 fs/fs_context.c:662 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc750979e79 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc751773038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fc750b16130 RCX: 00007fc750979e79 RDX: 0000000020000080 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007fc7509e793e R08: 00000000200000c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc750b16130 R15: 00007ffe94e2fd08 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:____rb_erase_color lib/rbtree.c:354 [inline] RIP: 0010:__rb_erase_color+0x2d7/0xa30 lib/rbtree.c:413 Code: 73 02 00 00 49 8d 5c 24 10 48 89 dd 48 c1 ed 03 42 80 7c 35 00 00 74 08 48 89 df e8 a3 6a 44 f6 4c 8b 2b 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 8a 6a 44 f6 41 f6 45 00 01 48 89 RSP: 0018:ffffc90002f4f040 EFLAGS: 00010046 RAX: 000000000016e360 RBX: ffff888140adbca0 RCX: dffffc0000000000 RDX: ffffffff81680de0 RSI: ffff8880b903ebc8 RDI: ffff888140adbc90 RBP: 1ffff1102815b794 R08: 000000000000013e R09: 1ffffffff20386c5 R10: dffffc0000000000 R11: ffffffff81671a60 R12: ffff888140adbc90 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fc7517736c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007facc2400210 CR3: 0000000027f36000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 73 02 jae 0x4 2: 00 00 add %al,(%rax) 4: 49 8d 5c 24 10 lea 0x10(%r12),%rbx 9: 48 89 dd mov %rbx,%rbp c: 48 c1 ed 03 shr $0x3,%rbp 10: 42 80 7c 35 00 00 cmpb $0x0,0x0(%rbp,%r14,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 a3 6a 44 f6 call 0xf6446ac3 20: 4c 8b 2b mov (%rbx),%r13 23: 4d 89 ef mov %r13,%r15 26: 49 c1 ef 03 shr $0x3,%r15 * 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 8a 6a 44 f6 call 0xf6446ac3 39: 41 f6 45 00 01 testb $0x1,0x0(%r13) 3e: 48 rex.W 3f: 89 .byte 0x89