[ 38.308500] audit: type=1800 audit(1560815434.021:32): pid=7449 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 57.790249] kauditd_printk_skb: 2 callbacks suppressed [ 57.790265] audit: type=1400 audit(1560815453.541:35): avc: denied { map } for pid=7627 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.168' (ECDSA) to the list of known hosts. executing program [ 380.575467] audit: type=1400 audit(1560815776.331:36): avc: denied { map } for pid=7639 comm="syz-executor269" path="/root/syz-executor269416557" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 546.624138] INFO: task syz-executor269:7817 blocked for more than 140 seconds. [ 546.632236] Not tainted 4.19.52 #24 [ 546.636674] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 546.645027] syz-executor269 D28216 7817 7639 0x00000004 [ 546.650752] Call Trace: [ 546.653463] __schedule+0x80d/0x1c70 [ 546.658381] ? pci_mmcfg_check_reserved+0x170/0x170 [ 546.663568] ? rwsem_down_read_failed+0x1e3/0x3c0 [ 546.668682] ? _raw_spin_unlock_irq+0x28/0x90 [ 546.673561] ? lockdep_hardirqs_on+0x415/0x5d0 [ 546.678344] schedule+0x92/0x1c0 [ 546.682800] rwsem_down_read_failed+0x21b/0x3c0 [ 546.688012] ? __rwsem_down_read_failed_common.part.0+0x80/0x80 [ 546.694374] call_rwsem_down_read_failed+0x18/0x30 [ 546.699496] down_read+0x49/0xb0 [ 546.703213] ? __do_page_fault+0xb1a/0xe90 [ 546.707937] __do_page_fault+0xb1a/0xe90 [ 546.712211] ? vmalloc_fault+0x740/0x740 [ 546.716652] ? trace_hardirqs_off_caller+0x65/0x220 [ 546.721704] ? trace_hardirqs_on_caller+0x6a/0x220 [ 546.726800] ? page_fault+0x8/0x30 [ 546.730366] do_page_fault+0x71/0x57d [ 546.734520] ? page_fault+0x8/0x30 [ 546.738173] page_fault+0x1e/0x30 [ 546.741627] RIP: 0033:0x4ab79d [ 546.745020] Code: Bad RIP value. [ 546.748433] RSP: 002b:00007ffeec1b1820 EFLAGS: 00010206 [ 546.754255] RAX: 00000000004ab8c0 RBX: 0000000000000001 RCX: 00000000006e0330 [ 546.763024] RDX: 0000000000407620 RSI: 0000000000000000 RDI: 00000000004ccb90 [ 546.770713] RBP: 00007ffeec1b1840 R08: 000000037ffffa00 R09: 000000037ffffa00 [ 546.778218] R10: 00007ffeec1b18b0 R11: 0000000000000000 R12: 0000000000000001 [ 546.787564] R13: 00000000006e0320 R14: 000000000000002d R15: 20c49ba5e353f7cf [ 546.795274] INFO: task syz-executor269:7818 blocked for more than 140 seconds. [ 546.802904] Not tainted 4.19.52 #24 [ 546.807227] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 546.815676] syz-executor269 D28312 7818 7639 0x80000004 [ 546.821324] Call Trace: [ 546.824169] __schedule+0x80d/0x1c70 [ 546.828093] ? pci_mmcfg_check_reserved+0x170/0x170 [ 546.833202] ? rwsem_down_read_failed+0x1e3/0x3c0 [ 546.838375] ? _raw_spin_unlock_irq+0x28/0x90 [ 546.842884] ? lockdep_hardirqs_on+0x415/0x5d0 [ 546.847643] schedule+0x92/0x1c0 [ 546.851019] rwsem_down_read_failed+0x21b/0x3c0 [ 546.855851] ? __rwsem_down_read_failed_common.part.0+0x80/0x80 [ 546.861985] ? __might_fault+0x12b/0x1e0 [ 546.866601] call_rwsem_down_read_failed+0x18/0x30 [ 546.871549] down_read+0x49/0xb0 [ 546.875130] ? do_exit+0x45b/0x2fa0 [ 546.878770] do_exit+0x45b/0x2fa0 [ 546.882228] ? __mutex_unlock_slowpath+0x307/0x6b0 [ 546.887505] ? trace_hardirqs_on+0x67/0x220 [ 546.891989] ? get_signal+0x384/0x1fc0 [ 546.896057] ? mm_update_next_owner+0x660/0x660 [ 546.900865] ? _raw_spin_unlock_irq+0x28/0x90 [ 546.905517] ? get_signal+0x384/0x1fc0 [ 546.909409] ? _raw_spin_unlock_irq+0x28/0x90 [ 546.914980] do_group_exit+0x135/0x370 [ 546.918884] get_signal+0x3ec/0x1fc0 [ 546.922600] ? __mutex_unlock_slowpath+0xf8/0x6b0 [ 546.927811] do_signal+0x95/0x1960 [ 546.931412] ? perf_ioctl+0x71/0x90 [ 546.935459] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 546.941320] ? do_vfs_ioctl+0x120/0x1380 [ 546.945656] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 546.951209] ? setup_sigcontext+0x7d0/0x7d0 [ 546.955722] ? ioctl_preallocate+0x210/0x210 [ 546.960193] ? selinux_file_mprotect+0x620/0x620 [ 546.965263] ? __x64_sys_futex+0x40d/0x590 [ 546.969641] ? exit_to_usermode_loop+0x43/0x2c0 [ 546.974483] ? do_syscall_64+0x53d/0x620 [ 546.978726] ? exit_to_usermode_loop+0x43/0x2c0 [ 546.983402] ? lockdep_hardirqs_on+0x415/0x5d0 [ 546.988170] ? trace_hardirqs_on+0x67/0x220 [ 546.992526] exit_to_usermode_loop+0x244/0x2c0 [ 546.997473] do_syscall_64+0x53d/0x620 [ 547.001380] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 547.007006] RIP: 0033:0x4468f9 [ 547.010215] Code: 67 66 69 6c 65 3d 64 65 62 75 67 2e 63 22 0a 00 00 45 52 52 4f 52 3a 20 6f 75 74 20 6f 66 20 6d 65 6d 6f 72 79 20 64 75 72 69 <6e> 67 20 64 65 62 75 67 20 73 65 74 75 70 0a 00 00 00 00 00 00 00 [ 547.030211] RSP: 002b:00007f79688eedb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 547.038931] RAX: fffffffffffffe00 RBX: 00000000006dbc28 RCX: 00000000004468f9 [ 547.047291] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc28 [ 547.054838] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 547.062588] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 547.070420] R13: 00007ffeec1b181f R14: 00007f79688ef9c0 R15: 20c49ba5e353f7cf [ 547.078022] [ 547.078022] Showing all locks held in the system: [ 547.084580] 1 lock held by khungtaskd/1031: [ 547.088905] #0: 00000000ab6fdb3e (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 547.098446] 3 locks held by rs:main Q:Reg/7486: [ 547.104134] 1 lock held by rsyslogd/7489: [ 547.108633] #0: 000000008ebd9283 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 547.117651] 2 locks held by getty/7610: [ 547.121632] #0: 000000001941e025 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 547.130466] #1: 0000000094b2e512 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 [ 547.139964] 2 locks held by getty/7611: [ 547.144367] #0: 00000000991fb8af (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 547.152642] #1: 000000002ef3e92f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 [ 547.161700] 2 locks held by getty/7612: [ 547.165983] #0: 00000000800958b3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 547.175284] #1: 000000007bda60ba (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 [ 547.184638] 2 locks held by getty/7613: [ 547.188821] #0: 00000000920f144a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 547.197478] #1: 00000000c4b7763e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 [ 547.206504] 2 locks held by getty/7614: [ 547.210476] #0: 0000000029e697b4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 547.219275] #1: 000000007d9cdfb2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 [ 547.228303] 2 locks held by getty/7615: [ 547.232276] #0: 0000000017c4ddbe (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 547.240689] #1: 00000000fa58b44e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 [ 547.249850] 2 locks held by getty/7616: [ 547.254048] #0: 00000000ab1cfc7c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 547.262323] #1: 000000001f0557e7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 [ 547.272160] 1 lock held by syz-executor269/7817: [ 547.277138] #0: 0000000077e3f004 (&mm->mmap_sem){++++}, at: __do_page_fault+0xb1a/0xe90 [ 547.285712] 1 lock held by syz-executor269/7818: [ 547.290477] #0: 0000000077e3f004 (&mm->mmap_sem){++++}, at: do_exit+0x45b/0x2fa0 [ 547.298407] 1 lock held by syz-executor269/7819: [ 547.303174] [ 547.305782] ============================================= [ 547.305782] [ 547.313103] NMI backtrace for cpu 1 [ 547.316884] CPU: 1 PID: 1031 Comm: khungtaskd Not tainted 4.19.52 #24 [ 547.323548] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 547.333072] Call Trace: [ 547.335861] dump_stack+0x172/0x1f0 [ 547.339496] nmi_cpu_backtrace.cold+0x63/0xa4 [ 547.344144] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 547.349088] nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 [ 547.354754] arch_trigger_cpumask_backtrace+0x14/0x20 [ 547.360037] watchdog+0x9df/0xee0 [ 547.363568] kthread+0x354/0x420 [ 547.367030] ? reset_hung_task_detector+0x30/0x30 [ 547.372054] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 547.377770] ret_from_fork+0x24/0x30 [ 547.381589] Sending NMI from CPU 1 to CPUs 0: [ 547.386740] NMI backtrace for cpu 0 [ 547.386746] CPU: 0 PID: 7819 Comm: syz-executor269 Not tainted 4.19.52 #24 [ 547.386753] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 547.386757] RIP: 0010:__sanitizer_cov_trace_pc+0x18/0x50 [ 547.386768] Code: e9 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 c8 e6 96 7e <81> e2 00 01 1f 00 75 2b 8b 90 d0 12 00 00 83 fa 02 75 20 48 8b 88 [ 547.386772] RSP: 0018:ffff88808ff6faa0 EFLAGS: 00000293 [ 547.386779] RAX: ffff8880817b4380 RBX: ffff8880a6472668 RCX: ffffffff818145fa [ 547.386784] RDX: 0000000080000000 RSI: ffffffff8181451e RDI: 0000000000000005 [ 547.386789] RBP: ffff88808ff6faa0 R08: ffff8880817b4380 R09: ffffed1014c8e4ce [ 547.386794] R10: ffffed1014c8e4cd R11: ffff8880a647266b R12: ffff8880a64725c0 [ 547.386799] R13: 0000000000000000 R14: 0000000000000000 R15: ffff888097c7a8f0 [ 547.386804] FS: 00007f79688ce700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 547.386809] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 547.386814] CR2: ffffffffff600400 CR3: 000000009f180000 CR4: 00000000001406f0 [ 547.386819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 547.386824] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 547.386826] Call Trace: [ 547.386830] perf_mmap+0x71e/0x1730 [ 547.386833] ? perf_release+0x50/0x50 [ 547.386836] ? do_munmap+0x893/0xed0 [ 547.386839] ? memset+0x32/0x40 [ 547.386842] mmap_region+0xc2f/0x1760 [ 547.386845] ? __x64_sys_brk+0x6c0/0x6c0 [ 547.386850] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 547.386854] ? get_unmapped_area+0x293/0x3b0 [ 547.386857] do_mmap+0x8e2/0x1080 [ 547.386860] vm_mmap_pgoff+0x1c5/0x230 [ 547.386864] ? vma_is_stack_for_current+0xd0/0xd0 [ 547.386867] ? iterate_fd+0x360/0x360 [ 547.386870] ksys_mmap_pgoff+0x4aa/0x630 [ 547.386874] ? find_mergeable_anon_vma+0x2e0/0x2e0 [ 547.386878] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 547.386881] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 547.386885] ? do_syscall_64+0x26/0x620 [ 547.386889] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 547.386892] __x64_sys_mmap+0xe9/0x1b0 [ 547.386895] do_syscall_64+0xfd/0x620 [ 547.386899] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 547.386902] RIP: 0033:0x4468f9 [ 547.386912] Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 547.386916] RSP: 002b:00007f79688cdda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 [ 547.386924] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004468f9 [ 547.386929] RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000020fff000 [ 547.386934] RBP: 00000000006dbc30 R08: 0000000000000003 R09: 0000000000000000 [ 547.386939] R10: 0000000000001011 R11: 0000000000000246 R12: 00000000006dbc3c [ 547.386944] R13: 00007ffeec1b181f R14: 00007f79688ce9c0 R15: 20c49ba5e353f7cf [ 547.387931] Kernel panic - not syncing: hung_task: blocked tasks [ 547.679308] CPU: 1 PID: 1031 Comm: khungtaskd Not tainted 4.19.52 #24 [ 547.685884] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 547.695611] Call Trace: [ 547.698209] dump_stack+0x172/0x1f0 [ 547.702013] panic+0x263/0x507 [ 547.705214] ? __warn_printk+0xf3/0xf3 [ 547.709402] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 547.714409] ? ___preempt_schedule+0x16/0x18 [ 547.718853] ? nmi_trigger_cpumask_backtrace+0x165/0x1f8 [ 547.724751] ? nmi_trigger_cpumask_backtrace+0x1c1/0x1f8 [ 547.730263] ? nmi_trigger_cpumask_backtrace+0x1cb/0x1f8 [ 547.735883] ? nmi_trigger_cpumask_backtrace+0x165/0x1f8 [ 547.741630] watchdog+0x9f0/0xee0 [ 547.745108] kthread+0x354/0x420 [ 547.748501] ? reset_hung_task_detector+0x30/0x30 [ 547.753435] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 547.758985] ret_from_fork+0x24/0x30 [ 547.764917] Kernel Offset: disabled [ 547.768581] Rebooting in 86400 seconds..