INFO: task syz-executor.1:926 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.1 D28128 926 8410 0x80000000 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 __do_sys_exit_group kernel/exit.c:992 [inline] __se_sys_exit_group kernel/exit.c:990 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:990 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: Bad RIP value. RSP: 002b:0000000000a6fd58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00000000004592c9 RDX: 0000000000412fb1 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffff R09: 0000000000a6fdb0 R10: 0000000000760fa8 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000a6fdb0 R14: 0000000000000000 R15: 0000000000a6fdc0 INFO: task syz-executor.1:935 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.1 D28528 935 8410 0x80004000 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:00007f1b1abfacf8 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: 00007f1b1abfb9c0 R15: 000000000075bfd4 INFO: task syz-executor.1:937 blocked for more than 144 seconds. Not tainted 5.2.0-rc5+ #57 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28512 937 8410 0x80004000 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:00007f1b1abd9cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075c078 RCX: 00000000004592c9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075c078 RBP: 000000000075c070 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075c07c R13: 0000000000a6fb4f R14: 00007f1b1abda9c0 R15: 000000000075c07c Showing all locks held in the system: 1 lock held by khungtaskd/1042: #0: 00000000c2b8770d (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5149 1 lock held by rsyslogd/8277: #0: 0000000078d752ed (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8367: #0: 00000000c0e8ead0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000072f48f10 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8368: #0: 00000000c41a43af (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000001759a365 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8369: #0: 000000001e5b2a59 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000e496a5b0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8370: #0: 000000004c4e1858 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d64eb4db (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8371: #0: 00000000df6da9bc (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000190d87b7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8372: #0: 0000000070620c4d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000754ad977 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8373: #0: 000000008c52d04e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b45e0bde (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/926: #0: 0000000066c8d180 (&mm->mmap_sem#2){++++}, at: exit_mm kernel/exit.c:513 [inline] #0: 0000000066c8d180 (&mm->mmap_sem#2){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:864 1 lock held by syz-executor.1/928: 1 lock held by syz-executor.1/935: #0: 0000000066c8d180 (&mm->mmap_sem#2){++++}, at: exit_mm kernel/exit.c:513 [inline] #0: 0000000066c8d180 (&mm->mmap_sem#2){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:864 1 lock held by syz-executor.1/937: #0: 0000000066c8d180 (&mm->mmap_sem#2){++++}, at: exit_mm kernel/exit.c:513 [inline] #0: 0000000066c8d180 (&mm->mmap_sem#2){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:864 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1042 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 45 Comm: kworker/u4:2 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:__lock_acquire+0xe9/0x5490 kernel/locking/lockdep.c:3665 Code: 4c 8b 1c 25 c0 fd 01 00 38 d0 7c 08 84 d2 0f 85 28 12 00 00 44 8b 05 ea b4 29 08 45 85 c0 0f 84 16 0a 00 00 8b 3d 47 a1 61 07 <85> ff 0f 85 5c 0a 00 00 45 31 ff 83 fe 01 0f 86 82 0a 00 00 31 d2 RSP: 0018:ffff8880a9b17aa0 EFLAGS: 00000002 RAX: 0000000000000007 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff8880a9b17c50 R08: 0000000000000001 R09: 0000000000000000 R10: ffffed1015d06c6f R11: ffff8880a9aea440 R12: 0000000000000000 R13: ffffffff88ba3700 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045929f CR3: 00000000780da000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4303 rcu_lock_acquire include/linux/rcupdate.h:208 [inline] rcu_read_lock include/linux/rcupdate.h:593 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline] batadv_nc_worker+0x117/0x760 net/batman-adv/network-coding.c:718 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