INFO: task syz-executor1:12976 blocked for more than 140 seconds. Not tainted 4.18.0+ #195 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D23320 12976 4476 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:733 [inline] chown_common+0x3a9/0x730 fs/open.c:640 do_fchownat+0x16e/0x250 fs/open.c:673 __do_sys_chown fs/open.c:693 [inline] __se_sys_chown fs/open.c:691 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:691 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f81951a4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000005c RAX: ffffffffffffffda RBX: 00007f81951a56d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000600 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cb3a0 R14: 00000000004c78eb R15: 0000000000000000 INFO: task syz-executor1:12981 blocked for more than 140 seconds. Not tainted 4.18.0+ #195 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D24480 12981 4476 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 request_wait_answer+0x4c8/0x920 fs/fuse/dev.c:463 __fuse_request_send+0x12a/0x1d0 fs/fuse/dev.c:483 fuse_request_send+0x62/0xa0 fs/fuse/dev.c:496 fuse_simple_request+0x33d/0x730 fs/fuse/dev.c:554 fuse_lookup_name+0x3ee/0x830 fs/fuse/dir.c:323 fuse_lookup+0xf9/0x4c0 fs/fuse/dir.c:360 fuse_atomic_open+0x223/0x350 fs/fuse/dir.c:499 atomic_open fs/namei.c:3031 [inline] lookup_open+0xdbb/0x1b90 fs/namei.c:3163 do_last fs/namei.c:3283 [inline] path_openat+0x23a7/0x4c90 fs/namei.c:3487 do_filp_open+0x255/0x380 fs/namei.c:3517 do_sys_open+0x584/0x760 fs/open.c:1061 __do_sys_openat fs/open.c:1088 [inline] __se_sys_openat fs/open.c:1082 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1082 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f8195183c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f81951846d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d2c18 R14: 00000000004c7e4e R15: 0000000000000001 INFO: task syz-executor1:12999 blocked for more than 140 seconds. Not tainted 4.18.0+ #195 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D23552 12999 4476 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0xc3/0x1d0 kernel/locking/rwsem.c:26 inode_lock_shared include/linux/fs.h:743 [inline] do_last fs/namei.c:3282 [inline] path_openat+0x2387/0x4c90 fs/namei.c:3487 do_filp_open+0x255/0x380 fs/namei.c:3517 do_sys_open+0x584/0x760 fs/open.c:1061 __do_sys_openat fs/open.c:1088 [inline] __se_sys_openat fs/open.c:1082 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1082 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f8195141c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f81951426d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 0000000000930280 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d2c18 R14: 00000000004c7e4e R15: 0000000000000003 INFO: task syz-executor1:13065 blocked for more than 140 seconds. Not tainted 4.18.0+ #195 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D25768 13065 4476 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:733 [inline] chown_common+0x3a9/0x730 fs/open.c:640 do_fchownat+0x16e/0x250 fs/open.c:673 __do_sys_chown fs/open.c:693 [inline] __se_sys_chown fs/open.c:691 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:691 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f8195120c78 EFLAGS: 00000246 ORIG_RAX: 000000000000005c RAX: ffffffffffffffda RBX: 00007f81951216d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000600 RBP: 0000000000930320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cb3a0 R14: 00000000004c78eb R15: 0000000000000004 Showing all locks held in the system: 1 lock held by khungtaskd/771: #0: 000000002f428db9 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 2 locks held by rs:main Q:Reg/4331: 1 lock held by rsyslogd/4333: 2 locks held by getty/4424: #0: 0000000029549663 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000000b4de706 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4425: #0: 00000000d176c6ea (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000035bc12c5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4426: #0: 000000002c2aacc9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000b2c5d83d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4427: #0: 00000000b6047647 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000d3d37de5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4428: #0: 00000000ac05d74d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000062532e35 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4429: #0: 00000000e9b74883 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000042102df9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4430: #0: 00000000fef16c29 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000031b6c737 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor1/12976: #0: 000000005d40b241 (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1572 [inline] #0: 000000005d40b241 (sb_writers#20){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: inode_lock include/linux/fs.h:733 [inline] #1: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: chown_common+0x3a9/0x730 fs/open.c:640 2 locks held by syz-executor1/12981: #0: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: inode_lock_shared include/linux/fs.h:743 [inline] #0: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: do_last fs/namei.c:3282 [inline] #0: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: path_openat+0x2387/0x4c90 fs/namei.c:3487 #1: 000000003aea1cc8 (&fi->mutex){+.+.}, at: fuse_lock_inode+0xaf/0xe0 fs/fuse/inode.c:363 1 lock held by syz-executor1/12999: #0: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: inode_lock_shared include/linux/fs.h:743 [inline] #0: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: do_last fs/namei.c:3282 [inline] #0: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: path_openat+0x2387/0x4c90 fs/namei.c:3487 2 locks held by syz-executor1/13065: #0: 000000005d40b241 (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1572 [inline] #0: 000000005d40b241 (sb_writers#20){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: inode_lock include/linux/fs.h:733 [inline] #1: 000000006aa5898f (&type->i_mutex_dir_key#5){++++}, at: chown_common+0x3a9/0x730 fs/open.c:640 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 771 Comm: khungtaskd Not tainted 4.18.0+ #195 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:56