[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 984.926433][ T1134] INFO: task syz-executor025:7028 blocked for more than 143 seconds. [ 984.926449][ T1134] Not tainted 5.6.0-syzkaller #0 [ 984.926454][ T1134] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 984.926459][ T1134] syz-executor025 D28496 7028 7026 0x00004004 [ 984.926479][ T1134] Call Trace: [ 984.926648][ T1134] ? __schedule+0x805/0xc90 [ 984.926670][ T1134] ? schedule+0x188/0x220 [ 984.926682][ T1134] ? schedule_preempt_disabled+0xf/0x20 [ 984.926691][ T1134] ? __mutex_lock_common+0x129f/0x2fc0 [ 984.926788][ T1134] ? fb_open+0x14b/0x3b0 [ 984.926808][ T1134] ? mutex_lock_nested+0x1a/0x20 [ 984.926817][ T1134] ? fb_open+0x14b/0x3b0 [ 984.926906][ T1134] ? chrdev_open+0x498/0x580 [ 984.926918][ T1134] ? cd_forget+0x150/0x150 [ 984.926948][ T1134] ? do_dentry_open+0x82e/0x10b0 [ 984.926970][ T1134] ? path_openat+0x2790/0x38b0 [ 984.927015][ T1134] ? do_filp_open+0x191/0x3a0 [ 984.927036][ T1134] ? _raw_spin_unlock+0x24/0x40 [ 984.927069][ T1134] ? __alloc_fd+0x566/0x600 [ 984.927090][ T1134] ? do_sys_openat2+0x463/0x770 [ 984.927108][ T1134] ? __x64_sys_openat+0x1c8/0x1f0 [ 984.927164][ T1134] ? do_syscall_64+0xf3/0x1b0 [ 984.927176][ T1134] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 984.927200][ T1134] INFO: task syz-executor025:7029 blocked for more than 143 seconds. [ 984.927206][ T1134] Not tainted 5.6.0-syzkaller #0 [ 984.927211][ T1134] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 984.927215][ T1134] syz-executor025 D28528 7029 7025 0x00004004 [ 984.927239][ T1134] Call Trace: [ 984.927253][ T1134] ? __schedule+0x805/0xc90 [ 984.927273][ T1134] ? schedule+0x188/0x220 [ 984.927285][ T1134] ? schedule_preempt_disabled+0xf/0x20 [ 984.927294][ T1134] ? __mutex_lock_common+0x129f/0x2fc0 [ 984.927316][ T1134] ? fb_open+0x14b/0x3b0 [ 984.927335][ T1134] ? mutex_lock_nested+0x1a/0x20 [ 984.927344][ T1134] ? fb_open+0x14b/0x3b0 [ 984.927359][ T1134] ? chrdev_open+0x498/0x580 [ 984.927371][ T1134] ? cd_forget+0x150/0x150 [ 984.927382][ T1134] ? do_dentry_open+0x82e/0x10b0 [ 984.927404][ T1134] ? path_openat+0x2790/0x38b0 [ 984.927449][ T1134] ? do_filp_open+0x191/0x3a0 [ 984.927470][ T1134] ? _raw_spin_unlock+0x24/0x40 [ 984.927479][ T1134] ? __alloc_fd+0x566/0x600 [ 984.927499][ T1134] ? do_sys_openat2+0x463/0x770 [ 984.927518][ T1134] ? __x64_sys_openat+0x1c8/0x1f0 [ 984.927535][ T1134] ? do_syscall_64+0xf3/0x1b0 [ 984.927547][ T1134] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 984.927569][ T1134] INFO: task syz-executor025:7030 blocked for more than 143 seconds. [ 984.927574][ T1134] Not tainted 5.6.0-syzkaller #0 [ 984.927579][ T1134] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 984.927584][ T1134] syz-executor025 D27616 7030 7022 0x00004004 [ 984.927599][ T1134] Call Trace: [ 984.927612][ T1134] ? __schedule+0x805/0xc90 [ 984.927633][ T1134] ? schedule+0x188/0x220 [ 984.927645][ T1134] ? schedule_preempt_disabled+0xf/0x20 [ 984.927653][ T1134] ? __mutex_lock_common+0x129f/0x2fc0 [ 984.927675][ T1134] ? fb_open+0x14b/0x3b0 [ 984.927694][ T1134] ? mutex_lock_nested+0x1a/0x20 [ 984.927703][ T1134] ? fb_open+0x14b/0x3b0 [ 984.927718][ T1134] ? chrdev_open+0x498/0x580 [ 984.927730][ T1134] ? cd_forget+0x150/0x150 [ 984.927741][ T1134] ? do_dentry_open+0x82e/0x10b0 [ 984.927763][ T1134] ? path_openat+0x2790/0x38b0 [ 984.927808][ T1134] ? do_filp_open+0x191/0x3a0 [ 984.927829][ T1134] ? _raw_spin_unlock+0x24/0x40 [ 984.927838][ T1134] ? __alloc_fd+0x566/0x600 [ 984.927858][ T1134] ? do_sys_openat2+0x463/0x770 [ 984.927877][ T1134] ? __x64_sys_openat+0x1c8/0x1f0 [ 984.927894][ T1134] ? do_syscall_64+0xf3/0x1b0 [ 984.927906][ T1134] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 984.927928][ T1134] INFO: task syz-executor025:7031 blocked for more than 143 seconds. [ 984.927933][ T1134] Not tainted 5.6.0-syzkaller #0 [ 984.927938][ T1134] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 984.927942][ T1134] syz-executor025 D28352 7031 7027 0x00004004 [ 984.927958][ T1134] Call Trace: [ 984.927970][ T1134] ? __schedule+0x805/0xc90 [ 984.927991][ T1134] ? schedule+0x188/0x220 [ 984.928003][ T1134] ? schedule_preempt_disabled+0xf/0x20 [ 984.928011][ T1134] ? __mutex_lock_common+0x129f/0x2fc0 [ 984.928033][ T1134] ? fb_open+0x14b/0x3b0 [ 984.928053][ T1134] ? mutex_lock_nested+0x1a/0x20 [ 984.928062][ T1134] ? fb_open+0x14b/0x3b0 [ 984.928077][ T1134] ? chrdev_open+0x498/0x580 [ 984.928088][ T1134] ? cd_forget+0x150/0x150 [ 984.928100][ T1134] ? do_dentry_open+0x82e/0x10b0 [ 984.928121][ T1134] ? path_openat+0x2790/0x38b0 [ 984.928166][ T1134] ? do_filp_open+0x191/0x3a0 [ 984.928187][ T1134] ? _raw_spin_unlock+0x24/0x40 [ 984.928196][ T1134] ? __alloc_fd+0x566/0x600 [ 984.928216][ T1134] ? do_sys_openat2+0x463/0x770 [ 984.928240][ T1134] ? __x64_sys_openat+0x1c8/0x1f0 [ 984.928257][ T1134] ? do_syscall_64+0xf3/0x1b0 [ 984.928269][ T1134] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 984.928294][ T1134] INFO: task syz-executor025:7032 blocked for more than 143 seconds. [ 984.928300][ T1134] Not tainted 5.6.0-syzkaller #0 [ 984.928305][ T1134] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 984.928309][ T1134] syz-executor025 D27696 7032 7024 0x00004004 [ 984.928324][ T1134] Call Trace: [ 984.928337][ T1134] ? __schedule+0x805/0xc90 [ 984.928357][ T1134] ? schedule+0x188/0x220 [ 984.928369][ T1134] ? schedule_preempt_disabled+0xf/0x20 [ 984.928378][ T1134] ? __mutex_lock_common+0x129f/0x2fc0 [ 984.928400][ T1134] ? fb_open+0x14b/0x3b0 [ 984.928419][ T1134] ? mutex_lock_nested+0x1a/0x20 [ 984.928428][ T1134] ? fb_open+0x14b/0x3b0 [ 984.928449][ T1134] ? chrdev_open+0x498/0x580 [ 984.928461][ T1134] ? cd_forget+0x150/0x150 [ 984.928476][ T1134] ? do_dentry_open+0x82e/0x10b0 [ 984.928498][ T1134] ? path_openat+0x2790/0x38b0 [ 984.928543][ T1134] ? do_filp_open+0x191/0x3a0 [ 984.928567][ T1134] ? _raw_spin_unlock+0x24/0x40 [ 984.928577][ T1134] ? __alloc_fd+0x566/0x600 [ 984.928601][ T1134] ? do_sys_openat2+0x463/0x770 [ 984.928620][ T1134] ? __x64_sys_openat+0x1c8/0x1f0 [ 984.928637][ T1134] ? do_syscall_64+0xf3/0x1b0 [ 984.928649][ T1134] ? entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 984.928669][ T1134] [ 984.928669][ T1134] Showing all locks held in the system: [ 984.928681][ T1134] 1 lock held by khungtaskd/1134: [ 984.928685][ T1134] #0: ffffffff892e6c10 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 984.928756][ T1134] 1 lock held by in:imklog/6668: [ 984.928760][ T1134] #0: ffff88809fca6630 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x25d/0x2f0 [ 984.928810][ T1134] 2 locks held by syz-executor025/7023: [ 984.928817][ T1134] 1 lock held by syz-executor025/7028: [ 984.928820][ T1134] #0: ffff8880a34d2078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 [ 984.928841][ T1134] 1 lock held by syz-executor025/7029: [ 984.928845][ T1134] #0: ffff8880a34d2078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 [ 984.928866][ T1134] 1 lock held by syz-executor025/7030: [ 984.928870][ T1134] #0: ffff8880a34d2078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 [ 984.928891][ T1134] 1 lock held by syz-executor025/7031: [ 984.928895][ T1134] #0: ffff8880a34d2078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 [ 984.928915][ T1134] 1 lock held by syz-executor025/7032: [ 984.928919][ T1134] #0: ffff8880a34d2078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0x14b/0x3b0 [ 984.928937][ T1134] [ 984.928942][ T1134] ============================================= [ 984.928942][ T1134] [ 984.928947][ T1134] NMI backtrace for cpu 1 [ 984.928957][ T1134] CPU: 1 PID: 1134 Comm: khungtaskd Not tainted 5.6.0-syzkaller #0 [ 984.928962][ T1134] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 984.928966][ T1134] Call Trace: [ 984.929019][ T1134] dump_stack+0x1e9/0x30e [ 984.929033][ T1134] nmi_cpu_backtrace+0x9f/0x180 [ 984.929078][ T1134] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 984.929088][ T1134] nmi_trigger_cpumask_backtrace+0x16a/0x280 [ 984.929151][ T1134] watchdog+0xd2a/0xd40 [ 984.929197][ T1134] kthread+0x353/0x380 [ 984.929206][ T1134] ? hungtask_pm_notify+0x50/0x50 [ 984.929213][ T1134] ? kthread_blkcg+0xd0/0xd0 [ 984.929224][ T1134] ret_from_fork+0x24/0x30 [ 984.929248][ T1134] Sending NMI from CPU 1 to CPUs 0: [ 984.929553][ C0] NMI backtrace for cpu 0 [ 984.929557][ C0] CPU: 0 PID: 7023 Comm: syz-executor025 Not tainted 5.6.0-syzkaller #0 [ 984.929561][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 984.929563][ C0] RIP: 0010:bitfill_aligned+0x130/0x1f0 [ 984.929569][ C0] Code: fd ab fd 44 8b 24 24 48 8b 44 24 18 31 d2 f7 74 24 04 89 c5 bf 07 00 00 00 89 c6 e8 4a 01 ac fd 83 fd 07 76 3b 4c 8b 7c 24 08 <4c> 89 33 4c 89 73 08 4c 89 73 10 4c 89 73 18 4c 89 73 20 4c 89 73 [ 984.929572][ C0] RSP: 0018:ffffc900021678f8 EFLAGS: 00000296 [ 984.929577][ C0] RAX: ffffffff83c75520 RBX: ffff8880000a0200 RCX: ffff888092a04380 [ 984.929580][ C0] RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000000000007 [ 984.929583][ C0] RBP: 0000000000000010 R08: ffffffff83c754e6 R09: 0000000000000040 [ 984.929586][ C0] R10: ffff888092a04380 R11: 0000000000000002 R12: 0000000000000000 [ 984.929589][ C0] R13: ffffffffffffffff R14: 0000000000000000 R15: ffffffffffffffff [ 984.929592][ C0] FS: 00000000017f9880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 984.929594][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 984.929597][ C0] CR2: 00007f641f6541f0 CR3: 0000000093d6a000 CR4: 00000000001406f0 [ 984.929600][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 984.929603][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 984.929605][ C0] Call Trace: [ 984.929607][ C0] ? bitfill_aligned_rev+0x1e0/0x1e0 [ 984.929609][ C0] cfb_fillrect+0x57b/0x790 [ 984.929611][ C0] bit_clear_margins+0x37b/0x620 [ 984.929613][ C0] fbcon_switch+0x1448/0x1e40 [ 984.929615][ C0] redraw_screen+0x4fc/0x16f0 [ 984.929617][ C0] fbcon_modechanged+0x8d5/0xd90 [ 984.929619][ C0] fb_set_var+0x822/0xcc0 [ 984.929621][ C0] do_fb_ioctl+0x502/0x6f0 [ 984.929623][ C0] ? fb_write+0x540/0x540 [ 984.929625][ C0] __se_sys_ioctl+0xf9/0x160 [ 984.929627][ C0] do_syscall_64+0xf3/0x1b0 [ 984.929630][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 984.929631][ C0] RIP: 0033:0x441419 [ 984.929638][ C0] Code: e8 ac e8 ff ff 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 984.929640][ C0] RSP: 002b:00007ffea286b408 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 984.929645][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441419 [ 984.929648][ C0] RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000003 [ 984.929651][ C0] RBP: 00000000006cb018 R08: 00000000004002c8 R09: 00000000004002c8 [ 984.929654][ C0] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402190 [ 984.929657][ C0] R13: 0000000000402220 R14: 0000000000000000 R15: 0000000000000000 [ 984.937803][ T1134] Kernel panic - not syncing: hung_task: blocked tasks [ 984.937817][ T1134] CPU: 1 PID: 1134 Comm: khungtaskd Not tainted 5.6.0-syzkaller #0 [ 984.937822][ T1134] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 984.937826][ T1134] Call Trace: [ 984.937842][ T1134] dump_stack+0x1e9/0x30e [ 984.937936][ T1134] panic+0x264/0x7a0 [ 984.937948][ T1134] ? nmi_trigger_cpumask_backtrace+0x206/0x280 [ 984.937964][ T1134] watchdog+0xd3d/0xd40 [ 984.937984][ T1134] kthread+0x353/0x380 [ 984.937994][ T1134] ? hungtask_pm_notify+0x50/0x50 [ 984.938001][ T1134] ? kthread_blkcg+0xd0/0xd0 [ 984.938012][ T1134] ret_from_fork+0x24/0x30 [ 984.939577][ T1134] Kernel Offset: disabled [ 986.067064][ T1134] Rebooting in 86400 seconds..