NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.2:6352 blocked for more than 140 seconds. Not tainted 4.14.180-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D25760 6352 1 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:588 [inline] rwsem_down_write_failed+0x5c3/0xbb0 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+0x4f/0x90 kernel/locking/rwsem.c:56 inode_lock include/linux/fs.h:719 [inline] vfs_unlink+0xc0/0x480 fs/namei.c:4018 do_unlinkat+0x315/0x5d0 fs/namei.c:4092 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c5d7 RSP: 002b:00007ffe131a9548 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045c5d7 RDX: 00007ffe131a9560 RSI: 00007ffe131a9560 RDI: 00007ffe131a95f0 RBP: 00000000000002c7 R08: 0000000000000000 R09: 0000000000000009 R10: 0000000000000003 R11: 0000000000000246 R12: 00007ffe131aa680 R13: 0000000001392940 R14: 0000000000000000 R15: 00007ffe131aa680 Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 3 locks held by syz-executor.2/6352: #0: (sb_writers#3){.+.+}, at: [] sb_start_write include/linux/fs.h:1549 [inline] #0: (sb_writers#3){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&type->i_mutex_dir_key#3/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #1: (&type->i_mutex_dir_key#3/1){+.+.}, at: [] do_unlinkat+0x201/0x5d0 fs/namei.c:4078 #2: (&sb->s_type->i_mutex_key#9){++++}, at: [] inode_lock include/linux/fs.h:719 [inline] #2: (&sb->s_type->i_mutex_key#9){++++}, at: [] vfs_unlink+0xc0/0x480 fs/namei.c:4018 3 locks held by syz-executor.2/16668: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xa6/0xc0 fs/file.c:769 #1: (sb_writers#3){.+.+}, at: [] file_start_write include/linux/fs.h:2708 [inline] #1: (sb_writers#3){.+.+}, at: [] vfs_write+0x3a6/0x4e0 fs/read_write.c:543 #2: (&sb->s_type->i_mutex_key#9){++++}, at: [] inode_trylock include/linux/fs.h:739 [inline] #2: (&sb->s_type->i_mutex_key#9){++++}, at: [] ext4_file_write_iter+0x1d5/0xdc0 fs/ext4/file.c:236 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 4.14.180-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+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e 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+0x5e2/0xb80 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3629 Comm: systemd-journal Not tainted 4.14.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888094588440 task.stack: ffff888094590000 RIP: 0010:rcu_read_lock_sched_held+0x7/0x130 kernel/rcu/update.c:106 RSP: 0018:ffff888094597c50 EFLAGS: 00000046 RAX: ffffffff88922cc4 RBX: 1ffff110128b2f90 RCX: 1ffffffff10279fc RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888094588cc4 RBP: 00000000000442c0 R08: 0000000000001000 R09: ffff888094597cb0 R10: ffff888094588cc8 R11: ffff888094588440 R12: 0000000000000001 R13: ffff888094597d00 R14: 00000000000442c0 R15: ffffea0001362480 FS: 00007f9392ad88c0(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f938ff8f000 CR3: 0000000094a70000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_mm_page_alloc include/trace/events/kmem.h:195 [inline] __alloc_pages_nodemask+0x5e0/0x700 mm/page_alloc.c:4207 __alloc_pages include/linux/gfp.h:484 [inline] __alloc_pages_node include/linux/gfp.h:497 [inline] kmem_getpages mm/slab.c:1419 [inline] cache_grow_begin+0x7b/0x410 mm/slab.c:2676 cache_alloc_refill mm/slab.c:3043 [inline] ____cache_alloc mm/slab.c:3125 [inline] ____cache_alloc mm/slab.c:3108 [inline] __do_cache_alloc mm/slab.c:3347 [inline] slab_alloc mm/slab.c:3382 [inline] kmem_cache_alloc+0x695/0x770 mm/slab.c:3550 getname_flags fs/namei.c:138 [inline] getname_flags+0xc8/0x560 fs/namei.c:128 user_path_at_empty+0x2a/0x50 fs/namei.c:2631 user_path_at include/linux/namei.h:57 [inline] SYSC_faccessat fs/open.c:403 [inline] SyS_faccessat fs/open.c:353 [inline] SYSC_access fs/open.c:450 [inline] SyS_access+0x21a/0x680 fs/open.c:448 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f9391d949c7 RSP: 002b:00007ffed23aa5f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffed23ad620 RCX: 00007f9391d949c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055d7754529a3 RBP: 00007ffed23aa740 R08: 000055d7754483e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000055d7758538c0 R15: 00007ffed23aac30 Code: 48 c1 e8 09 48 83 f0 01 83 e0 01 c3 0f 0b 48 c7 c7 80 66 d1 87 e8 3a a5 38 00 eb d3 0f 1f 84 00 00 00 00 00 48 c7 c0 c4 2c 92 88 <53> 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03