INFO: task syz-executor.0:958 blocked for more than 143 seconds. Not tainted 5.2.0-rc5+ #57 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28128 958 9012 0x80004004 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:495 [inline] rwsem_down_read_failed+0x213/0x460 kernel/locking/rwsem-xadd.c:515 __down_read kernel/locking/rwsem.h:178 [inline] down_read+0xa5/0x1e0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:513 [inline] do_exit+0x443/0x2fa0 kernel/exit.c:864 do_group_exit+0x135/0x370 kernel/exit.c:981 get_signal+0x471/0x24b0 kernel/signal.c:2640 do_signal+0x87/0x1900 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45931a Code: Bad RIP value. RSP: 002b:0000000000a6faa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: fffffffffffffffc RBX: 0000000000000003 RCX: 000000000045931a RDX: 0000000000000003 RSI: 0000000000021000 RDI: 0000000000000000 RBP: ffffffffffffffff R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000021000 R14: 0000000000020022 R15: 0000000000000000 INFO: task syz-executor.0:967 blocked for more than 143 seconds. Not tainted 5.2.0-rc5+ #57 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28624 967 9012 0x80004004 Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:495 [inline] rwsem_down_read_failed+0x213/0x460 kernel/locking/rwsem-xadd.c:515 __down_read kernel/locking/rwsem.h:178 [inline] down_read+0xa5/0x1e0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:513 [inline] do_exit+0x443/0x2fa0 kernel/exit.c:864 do_group_exit+0x135/0x370 kernel/exit.c:981 get_signal+0x471/0x24b0 kernel/signal.c:2640 do_signal+0x87/0x1900 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x58e/0x680 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: Bad RIP value. RSP: 002b:00007f313e368cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bfd0 RCX: 00000000004592c9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bfd0 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bfd4 R13: 0000000000a6fb4f R14: 00007f313e3699c0 R15: 000000000075bfd4 Showing all locks held in the system: 1 lock held by khungtaskd/1044: #0: 0000000057966d4a (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5149 1 lock held by rsyslogd/8883: #0: 000000007775324b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8973: #0: 000000002221c7f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000000fa4b31 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8974: #0: 00000000cda90db7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000ca00c807 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8975: #0: 00000000ccc7d650 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000044f344af (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8976: #0: 00000000247e1028 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000dcbdb76c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8977: #0: 000000006ffd75da (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000085940910 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8978: #0: 00000000d4c92823 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000129fe623 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8979: #0: 00000000c59de36c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000a8cec39 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.0/958: #0: 00000000e8fc5623 (&mm->mmap_sem#2){++++}, at: exit_mm kernel/exit.c:513 [inline] #0: 00000000e8fc5623 (&mm->mmap_sem#2){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:864 1 lock held by syz-executor.0/960: 1 lock held by syz-executor.0/967: #0: 00000000e8fc5623 (&mm->mmap_sem#2){++++}, at: exit_mm kernel/exit.c:513 [inline] #0: 00000000e8fc5623 (&mm->mmap_sem#2){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:864 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1044 Comm: khungtaskd Not tainted 5.2.0-rc5+ #57 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:289 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9090 Comm: kworker/u4:5 Not tainted 5.2.0-rc5+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:__read_once_size include/linux/compiler.h:194 [inline] RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] RIP: 0010:batadv_nc_worker+0x15f/0x760 net/batman-adv/network-coding.c:718 Code: b6 25 02 d6 7b 02 31 ff 44 89 e6 e8 3b d1 6f fa 45 84 e4 0f 84 75 03 00 00 e8 ed cf 6f fa 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <0f> 85 61 05 00 00 4d 8b 36 eb 46 e8 d1 cf 6f fa 49 81 ee 88 01 00 RSP: 0018:ffff88805ae9fce0 EFLAGS: 00000246 RAX: 1ffff1100c1ea063 RBX: ffff88808e150b00 RCX: ffffffff8700f4c9 RDX: 0000000000000000 RSI: ffffffff8700f143 RDI: 0000000000000001 RBP: ffff88805ae9fd30 R08: ffff88805ae941c0 R09: ffffed1015d26c70 R10: ffffed1015d26c6f R11: ffff8880ae93637b R12: 0000000000000001 R13: 000000000000002b R14: ffff888060f50318 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045929f CR3: 0000000090a8a000 CR4: 00000000001426e0 Call Trace: process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352