audit: type=1326 audit(1537253496.088:40): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12937 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4572d9 code=0x0 audit: type=1326 audit(1537253496.128:41): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12950 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4572d9 code=0x0 INFO: task syz-executor1:8408 blocked for more than 140 seconds. Not tainted 4.19.0-rc4+ #242 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D25192 8408 7911 0x00000000 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_timeout+0x1cc/0x260 kernel/time/timer.c:1780 down_read_failed drivers/tty/tty_ldsem.c:224 [inline] __ldsem_down_read_nested+0x538/0xb80 drivers/tty/tty_ldsem.c:318 ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 tty_ldisc_ref_wait+0x25/0x80 drivers/tty/tty_ldisc.c:263 tty_ioctl+0x512/0x1820 drivers/tty/tty_io.c:2650 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4572d9 Code: Bad RIP value. RSP: 002b:00007f2904763c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f29047646d4 RCX: 00000000004572d9 RDX: 0000000020000080 RSI: 00000000400445a0 RDI: 0000000000000006 RBP: 0000000000930320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cece0 R14: 00000000004c517e R15: 0000000000000004 Showing all locks held in the system: 1 lock held by khungtaskd/985: #0: 00000000edb32b43 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435 1 lock held by rsyslogd/5222: #0: 00000000c3d32851 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5311: #0: 0000000061a12003 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000cf6e2373 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5312: #0: 00000000db597ce1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000008d51f96b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5313: #0: 000000002f630d0a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000bb377d4b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5314: #0: 00000000fab19fc5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000ff56a9a0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5315: #0: 000000008befa07b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000081b7d6ab (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5316: #0: 000000004f675e97 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000000f0061d7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5317: #0: 000000001034ba8e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 audit: type=1326 audit(1537253496.848:42): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12965 comm="syz-executor4" exe="/root/syz-executor4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4572d9 code=0x0 #1: 00000000a632fe92 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor1/8379: #0: 0000000086f828e5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000026a40e27 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor1/8408: #0: 0000000086f828e5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 1 lock held by syz-executor3/12960: #0: 000000006bf0aaf4 (&sb->s_type->i_mutex_key#12){+.+.}, at: inode_lock include/linux/fs.h:738 [inline] #0: 000000006bf0aaf4 (&sb->s_type->i_mutex_key#12){+.+.}, at: __sock_release+0x8b/0x250 net/socket.c:578 1 lock held by syz-executor4/12965: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 985 Comm: khungtaskd Not tainted 4.19.0-rc4+ #242 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 0 to CPUs 1: NMI backtrace for cpu 1 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.921 msecs CPU: 1 PID: 12972 Comm: syz-executor2 Not tainted 4.19.0-rc4+ #242 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:____rb_erase_color lib/rbtree.c:370 [inline] RIP: 0010:rb_erase+0x788/0x3710 lib/rbtree.c:462 Code: 4c 89 c0 48 c1 e8 03 80 3c 18 00 0f 85 58 21 00 00 4d 8b 7c 24 10 4c 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 79 21 00 00 49 8b 07 <4d> 8d 4f 08 4c 89 c9 48 c1 e9 03 83 e0 01 80 3c 19 00 0f 85 de 22 RSP: 0018:ffff88010beb67c8 EFLAGS: 00000246 RAX: ffff8801d911c319 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 1ffff100217d6d01 RSI: ffffed00217d6d55 RDI: ffff8801d911c320 RBP: ffff88010beb71d0 R08: ffff8801d911c328 R09: ffff8801d7dd4f28 R10: fffffbfff12c65a8 R11: ffffffff89632d43 R12: ffff8801d911c318 R13: ffffffff8b3cb9e0 R14: ffff88010beb71a8 R15: ffff8801cdef5718 FS: 00007fa780dd7700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000706138 CR3: 00000001d3026000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __free_vmap_area+0x18c/0x4c0 mm/vmalloc.c:572 __purge_vmap_area_lazy+0x186/0x280 mm/vmalloc.c:682 vm_unmap_aliases+0x498/0x610 mm/vmalloc.c:1108 change_page_attr_set_clr+0x2ad/0xf90 arch/x86/mm/pageattr.c:1497 change_page_attr_clear arch/x86/mm/pageattr.c:1560 [inline] set_memory_ro+0x7b/0xa0 arch/x86/mm/pageattr.c:1789 bpf_prog_lock_ro include/linux/filter.h:693 [inline] bpf_prog_select_runtime+0xb3/0x650 kernel/bpf/core.c:1501 bpf_migrate_filter net/core/filter.c:1273 [inline] bpf_prepare_filter+0xbc6/0x1110 net/core/filter.c:1321 bpf_prog_create_from_user+0x1e1/0x2d0 net/core/filter.c:1415 seccomp_prepare_filter kernel/seccomp.c:395 [inline] seccomp_prepare_user_filter kernel/seccomp.c:430 [inline] seccomp_set_mode_filter kernel/seccomp.c:862 [inline] do_seccomp+0x934/0x2670 kernel/seccomp.c:935 __do_sys_seccomp kernel/seccomp.c:949 [inline] __se_sys_seccomp kernel/seccomp.c:946 [inline] __x64_sys_seccomp+0x73/0xb0 kernel/seccomp.c:946 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4572d9 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa780dd6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000013d RAX: ffffffffffffffda RBX: 00007fa780dd76d4 RCX: 00000000004572d9 RDX: 0000000020000100 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4908 R14: 00000000004c8bac R15: 0000000000000000 audit: type=1326 audit(1537253497.928:43): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=12970 comm="syz-executor2" exe="/root/syz-executor2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x4572d9 code=0x0