INFO: task syz-executor542:7989 blocked for more than 140 seconds. Not tainted 4.14.259-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor542 D27288 7989 7987 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x343/0x6d0 kernel/locking/rwsem-xadd.c:617 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write_nested+0x51/0x90 kernel/locking/rwsem.c:174 inode_lock_nested include/linux/fs.h:754 [inline] fuse_reverse_inval_entry+0x9e/0x5f0 fs/fuse/dir.c:972 fuse_notify_delete fs/fuse/dev.c:1584 [inline] fuse_notify fs/fuse/dev.c:1818 [inline] fuse_dev_do_write+0x1f22/0x25c0 fs/fuse/dev.c:1893 fuse_dev_write+0x125/0x1a0 fs/fuse/dev.c:1977 call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fd0839ed089 RSP: 002b:00007fd083999208 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd083a714c8 RCX: 00007fd0839ed089 RDX: 0000000000000029 RSI: 00000000200043c0 RDI: 0000000000000003 RBP: 00007fd083a714c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd083a714cc R13: 00007ffc107c112f R14: 00007fd083999300 R15: 0000000000022000 INFO: task syz-executor542:7994 blocked for more than 140 seconds. Not tainted 4.14.259-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor542 D28928 7994 7987 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 request_wait_answer+0x30d/0x620 fs/fuse/dev.c:478 __fuse_request_send+0x108/0x1a0 fs/fuse/dev.c:498 fuse_request_send fs/fuse/dev.c:511 [inline] fuse_simple_request+0x2fa/0x790 fs/fuse/dev.c:569 fuse_lookup_name+0x228/0x550 fs/fuse/dir.c:330 fuse_lookup+0xcd/0x390 fs/fuse/dir.c:368 lookup_real fs/namei.c:1555 [inline] __lookup_hash fs/namei.c:1575 [inline] __lookup_hash+0x1bb/0x270 fs/namei.c:1563 filename_create+0x156/0x3f0 fs/namei.c:3675 user_path_create fs/namei.c:3732 [inline] SYSC_mkdirat fs/namei.c:3864 [inline] SyS_mkdirat+0x95/0x270 fs/namei.c:3856 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fd0839ed089 RSP: 002b:00007fd083978208 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fd083a714d8 RCX: 00007fd0839ed089 RDX: 0000000000000000 RSI: 0000000020004380 RDI: 00000000ffffff9c RBP: 00007fd083a714d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd083a714dc R13: 00007ffc107c112f R14: 00007fd083978300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1534: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7685: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:778 2 locks held by syz-executor542/7989: #0: (&fc->killsb){.+.+}, at: [] fuse_notify_inval_entry fs/fuse/dev.c:1531 [inline] #0: (&fc->killsb){.+.+}, at: [] fuse_notify fs/fuse/dev.c:1809 [inline] #0: (&fc->killsb){.+.+}, at: [] fuse_dev_do_write+0xc80/0x25c0 fs/fuse/dev.c:1893 #1: (&type->i_mutex_dir_key#7/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #1: (&type->i_mutex_dir_key#7/1){+.+.}, at: [] fuse_reverse_inval_entry+0x9e/0x5f0 fs/fuse/dir.c:972 3 locks held by syz-executor542/7994: #0: (sb_writers#10){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#10){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&type->i_mutex_dir_key#7/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #1: (&type->i_mutex_dir_key#7/1){+.+.}, at: [] filename_create+0x12a/0x3f0 fs/namei.c:3674 #2: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xb0/0xe0 fs/fuse/inode.c:365 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.259-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4616 Comm: systemd-journal Not tainted 4.14.259-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a1b5a640 task.stack: ffff8880a1b60000 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_release+0x41e/0x870 kernel/locking/lockdep.c:4020 RSP: 0018:ffff8880a1b678a0 EFLAGS: 00000086 RAX: 1ffffffff11e1279 RBX: 1ffff1101436cf17 RCX: 1ffff1101436b5e3 RDX: dffffc0000000000 RSI: 0000000000000003 RDI: 0000000000000086 RBP: ffff8880a1b5a640 R08: ffffffff8b9ca1e0 R09: 0000000000000002 R10: 0000000000000000 R11: ffff8880a1b5a640 R12: aa719b8d105ca9d7 R13: 0000000000000003 R14: ffff8880a1b5a640 R15: 0000000000000003 FS: 00007f6c352968c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6c325da000 CR3: 00000000a1bec000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: seqcount_lockdep_reader_access include/linux/seqlock.h:82 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] read_seqbegin include/linux/seqlock.h:441 [inline] zone_span_seqbegin include/linux/memory_hotplug.h:80 [inline] page_outside_zone_boundaries+0xcf/0x310 mm/page_alloc.c:496 bad_range mm/page_alloc.c:525 [inline] __free_one_page mm/page_alloc.c:828 [inline] free_one_page+0x119/0x12a0 mm/page_alloc.c:1179 __free_pages_ok+0x3f1/0xeb0 mm/page_alloc.c:1268 slab_destroy mm/slab.c:1723 [inline] slabs_destroy+0x90/0xd0 mm/slab.c:1739 cache_flusharray mm/slab.c:3483 [inline] ___cache_free+0x213/0x2c0 mm/slab.c:3525 qlink_free mm/kasan/quarantine.c:147 [inline] qlist_free_all+0x79/0x140 mm/kasan/quarantine.c:166 quarantine_reduce+0x185/0x200 mm/kasan/quarantine.c:259 kasan_kmalloc+0xa2/0x160 mm/kasan/kasan.c:536 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 getname_flags+0xc8/0x550 fs/namei.c:138 do_sys_open+0x1ce/0x410 fs/open.c:1075 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f6c34825840 RSP: 002b:00007ffdf44263b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffdf44266c0 RCX: 00007f6c34825840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055f7d0c43480 RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055f7d0c3e040 R14: 00007ffdf4426680 R15: 000055f7d0c434d0 Code: 85 84 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 88 03 00 00 48 83 3d c6 c6 ae 07 00 0f 84 ba 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 c7 04 03 00 00 ---------------- Code disassembly (best guess): 0: 85 84 08 00 00 00 00 test %eax,0x0(%rax,%rcx,1) 7: 00 00 add %al,(%rax) 9: 48 c1 e8 03 shr $0x3,%rax d: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) 11: 0f 85 88 03 00 00 jne 0x39f 17: 48 83 3d c6 c6 ae 07 cmpq $0x0,0x7aec6c6(%rip) # 0x7aec6e5 1e: 00 1f: 0f 84 ba 01 00 00 je 0x1df 25: 48 8b 3c 24 mov (%rsp),%rdi 29: 57 push %rdi 2a: 9d popfq * 2b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 30: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 37: fc ff df 3a: 48 rex.W 3b: c7 .byte 0xc7 3c: 04 03 add $0x3,%al