syz-executor3 (10485) used greatest stack depth: 12112 bytes left INFO: task syz-executor4:5516 blocked for more than 140 seconds. Not tainted 4.19.0-rc5+ #32 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D18952 5516 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 fuse_lookup+0x8f/0x4c0 fs/fuse/dir.c:360 __lookup_slow+0x2b5/0x540 fs/namei.c:1671 lookup_slow+0x57/0x80 fs/namei.c:1688 walk_component+0x92b/0x25c0 fs/namei.c:1810 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x270/0x5160 fs/namei.c:3533 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4555a0 Code: 85 61 03 00 00 48 8b 84 24 48 01 00 00 48 8b 48 40 48 8b 94 24 50 01 00 00 48 8b 5a 40 48 39 d9 0f 85 28 03 00 00 48 89 8c 24 <88> 00 00 00 31 db eb 21 48 8b 74 24 60 48 8d 5e 01 48 8b 84 24 48 RSP: 002b:00007ffdbb93d9c0 EFLAGS: 00000206 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004555a0 RDX: 0000000000000000 RSI: 0000000000090800 RDI: 00000000004bc2ce RBP: 0000000000000298 R08: 0000000000000001 R09: 000000000173f940 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000010 R13: 000000000004c297 R14: 0000000000000074 R15: 0000000000000004 INFO: task syz-executor4:10474 blocked for more than 140 seconds. Not tainted 4.19.0-rc5+ #32 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D23288 10474 5516 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 d_wait_lookup fs/dcache.c:2428 [inline] d_alloc_parallel+0x1474/0x1f40 fs/dcache.c:2510 __lookup_slow+0x1e6/0x540 fs/namei.c:1654 lookup_slow+0x57/0x80 fs/namei.c:1688 walk_component+0x92b/0x25c0 fs/namei.c:1810 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x270/0x5160 fs/namei.c:3533 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4111d1 Code: cc cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 3a 48 83 ec 20 48 89 6c 24 18 48 8d 6c 24 18 48 8b 44 24 <28> 48 89 04 24 48 8b 44 24 30 48 89 44 24 08 e8 0b ff ff ff 48 8b RSP: 002b:00007fe0ba235bb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004111d1 RDX: 00007fe0ba235be8 RSI: 0000000000000002 RDI: 00007fe0ba235bd0 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000018 R10: 0000000000000006 R11: 0000000000000293 R12: 00007fe0ba2366d4 R13: 00000000004c4e54 R14: 00000000004d8268 R15: 00000000ffffffff INFO: task syz-executor4:10484 blocked for more than 140 seconds. Not tainted 4.19.0-rc5+ #32 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D23448 10484 5516 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 fuse_lookup+0x8f/0x4c0 fs/fuse/dir.c:360 __lookup_slow+0x2b5/0x540 fs/namei.c:1671 lookup_slow+0x57/0x80 fs/namei.c:1688 walk_component+0x92b/0x25c0 fs/namei.c:1810 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x270/0x5160 fs/namei.c:3533 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4111d1 Code: cc cc cc cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 3a 48 83 ec 20 48 89 6c 24 18 48 8d 6c 24 18 48 8b 44 24 <28> 48 89 04 24 48 8b 44 24 30 48 89 44 24 08 e8 0b ff ff ff 48 8b RSP: 002b:00007fe0ba214bb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000004111d1 RDX: fffffffffffffffb RSI: 0000000000000000 RDI: 00007fe0ba214bd0 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000018 R10: 0000000000000006 R11: 0000000000000293 R12: 00007fe0ba2156d4 R13: 00000000004c4e54 R14: 00000000004d8268 R15: 00000000ffffffff INFO: task syz-executor4:10490 blocked for more than 140 seconds. Not tainted 4.19.0-rc5+ #32 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D23432 10490 5516 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473 schedule+0xfe/0x460 kernel/sched/core.c:3517 request_wait_answer+0x4a6/0x900 fs/fuse/dev.c:474 __fuse_request_send+0x12a/0x1d0 fs/fuse/dev.c:494 fuse_request_send+0x62/0xa0 fs/fuse/dev.c:507 fuse_simple_request+0x33d/0x730 fs/fuse/dev.c:565 fuse_lookup_name+0x3ee/0x830 fs/fuse/dir.c:323 fuse_lookup+0xff/0x4c0 fs/fuse/dir.c:361 __lookup_slow+0x2b5/0x540 fs/namei.c:1671 lookup_slow+0x57/0x80 fs/namei.c:1688 walk_component+0x92b/0x25c0 fs/namei.c:1810 link_path_walk.part.40+0xa61/0x1530 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x270/0x5160 fs/namei.c:3533 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 24 08 48 89 01 e8 d7 2d fc ff e8 22 7a fc ff b8 02 00 00 00 48 8d 0d 2a 8a 08 01 87 01 8b 05 22 8a 08 01 83 f8 01 0f 85 8a 00 <00> 00 b8 01 00 00 00 88 05 5e 8f 08 01 84 c0 74 72 b8 01 00 00 00 RSP: 002b:00007fe0ba1f3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457579 RDX: 0000000000000002 RSI: 0000000020000100 RDI: ffffffffffffff9c RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe0ba1f46d4 R13: 00000000004c2bac R14: 00000000004d4218 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/985: #0: 0000000033ba2e27 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435 2 locks held by getty/5375: #0: 00000000c73af103 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000670fb7ea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5376: #0: 00000000ad3ec9d9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000034670e6a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5377: #0: 000000006a3adcc9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000003873e448 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5378: #0: 00000000750324c2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000015619fcb (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5380: #0: 00000000e157a2f1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000002cc4c48e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5381: #0: 00000000135cbb30 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000042ca705d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5382: #0: 00000000cb088ae0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000148f2e48 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor4/5516: #0: 000000008af4bf98 (&type->i_mutex_dir_key#9){++++}, at: inode_lock_shared include/linux/fs.h:748 [inline] #0: 000000008af4bf98 (&type->i_mutex_dir_key#9){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 #1: 00000000577362a0 (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 1 lock held by syz-executor4/10474: #0: 000000008af4bf98 (&type->i_mutex_dir_key#9){++++}, at: inode_lock_shared include/linux/fs.h:748 [inline] #0: 000000008af4bf98 (&type->i_mutex_dir_key#9){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 2 locks held by syz-executor4/10484: #0: 000000008af4bf98 (&type->i_mutex_dir_key#9){++++}, at: inode_lock_shared include/linux/fs.h:748 [inline] #0: 000000008af4bf98 (&type->i_mutex_dir_key#9){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 #1: 00000000577362a0 (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 2 locks held by syz-executor4/10490: #0: 000000008af4bf98 (&type->i_mutex_dir_key#9){++++}, at: inode_lock_shared include/linux/fs.h:748 [inline] #0: 000000008af4bf98 (&type->i_mutex_dir_key#9){++++}, at: lookup_slow+0x49/0x80 fs/namei.c:1687 #1: 00000000577362a0 (&fi->mutex){+.+.}, at: fuse_lock_inode+0xba/0xf0 fs/fuse/inode.c:365 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 985 Comm: khungtaskd Not tainted 4.19.0-rc5+ #32 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+0x1c4/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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:204 [inline] watchdog+0xb3e/0x1050 kernel/hung_task.c:265 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:57