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.3:29885 blocked for more than 140 seconds. Not tainted 4.14.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27888 29885 6360 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 request_wait_answer+0x30d/0x620 fs/fuse/dev.c:478 __fuse_request_send+0x108/0x1a0 fs/fuse/dev.c:498 fuse_simple_request+0x2a9/0x610 fs/fuse/dev.c:569 fuse_send_open.isra.0+0x162/0x1b0 fs/fuse/file.c:42 fuse_do_open+0x25f/0x460 fs/fuse/file.c:133 fuse_open_common+0x12a/0x250 fs/fuse/file.c:217 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0xb68/0x2aa0 fs/namei.c:3569 do_filp_open+0x18e/0x250 fs/namei.c:3603 do_sys_open+0x292/0x3e0 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45ca29 RSP: 002b:00007fb2c2ce5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00000000004f6c80 RCX: 000000000045ca29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000779 R14: 000000000052565f R15: 00007fb2c2ce66d4 Showing all locks held in the system: 1 lock held by khungtaskd/1048: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/5930: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xa6/0xc0 fs/file.c:769 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1048 Comm: khungtaskd Not tainted 4.14.182-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+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f 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: 5935 Comm: rs:main Q:Reg Not tainted 4.14.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88808a834440 task.stack: ffff8880a9410000 RIP: 0010:blk_tag_to_qc_t include/linux/blk_types.h:313 [inline] RIP: 0010:request_to_qc_t block/blk-mq.c:1568 [inline] RIP: 0010:blk_mq_make_request+0x7f5/0x1a90 block/blk-mq.c:1679 RSP: 0018:ffff8880a9417660 EFLAGS: 00000297 RAX: ffff88808a834440 RBX: ffff8880a19af230 RCX: 000000000000004a RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a19f1c5c RBP: 1ffff11015282ed1 R08: ffff88821fff705c R09: ffff88821fff7048 R10: ffff88821fff7050 R11: 000001b2be39e2cd R12: ffff888090f819a8 R13: ffff8880a19f1c00 R14: 0000000000000000 R15: 00000000ffffffff FS: 00007f1258b4f700(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f98a840d000 CR3: 000000008db44000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: generic_make_request block/blk-core.c:2227 [inline] generic_make_request+0x1fa/0x850 block/blk-core.c:2171 submit_bio+0x234/0x390 block/blk-core.c:2301 submit_bh_wbc+0x526/0x6f0 fs/buffer.c:3163 submit_bh fs/buffer.c:3169 [inline] __sync_dirty_buffer+0xc3/0x1c0 fs/buffer.c:3255 ext4_write_inode+0x396/0x420 fs/ext4/inode.c:5323 write_inode fs/fs-writeback.c:1227 [inline] __writeback_single_inode+0x7b0/0x1140 fs/fs-writeback.c:1426 writeback_single_inode+0x1f3/0x370 fs/fs-writeback.c:1480 sync_inode fs/fs-writeback.c:2508 [inline] sync_inode_metadata+0x79/0xa0 fs/fs-writeback.c:2528 __generic_file_fsync+0x121/0x190 fs/libfs.c:994 ext4_sync_file+0xad2/0x12b0 fs/ext4/fsync.c:120 vfs_fsync_range+0x103/0x250 fs/sync.c:196 generic_write_sync include/linux/fs.h:2678 [inline] ext4_file_write_iter+0x624/0xd90 fs/ext4/file.c:281 call_write_iter include/linux/fs.h:1778 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44e/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: 0033:0x7f125b5931cd RSP: 002b:00007f1258b4e590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1250022a50 RCX: 00007f125b5931cd RDX: 000000000000080f RSI: 00007f1250022a50 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f12500227d0 R13: 00007f1258b4e5b0 R14: 0000560893b3f360 R15: 000000000000080f Code: 0d 71 b6 12 7d 0f 85 60 fa ff ff e8 a6 6a 6b fe e8 1a 06 11 fe e9 51 fa ff ff 89 4c 24 18 41 c1 e6 10 e8 8f 6a 6b fe 8b 4c 24 18 <41> 09 ce 41 81 ce 00 00 00 80 e9 ac fb ff ff e8 77 6a 6b fe bf