NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.1:25798 blocked for more than 140 seconds. Not tainted 4.19.133-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29496 25798 25179 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x90e/0xef0 kernel/time/timer.c:1782 __down_common kernel/locking/semaphore.c:221 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:238 down+0x57/0x80 kernel/locking/semaphore.c:62 console_lock+0x25/0x80 kernel/printk/printk.c:2244 do_fb_ioctl+0x33e/0xb50 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1230 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c1d9 Code: 18 0f 57 c0 0f 11 44 24 20 48 c7 44 24 30 64 00 00 00 0f 11 44 24 38 48 89 5c 24 48 e8 c0 dc ff ff 48 8b 44 24 50 48 85 c0 75 <12> 48 8b 8c 24 c8 01 00 00 0f ba e1 00 0f 83 13 01 00 00 48 83 f8 RSP: 002b:00007fb2e7400c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000c480 RCX: 000000000045c1d9 RDX: 0000000020000080 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007fffd22fca9f R14: 00007fb2e74019c0 R15: 000000000078bfac INFO: task syz-executor.3:25802 blocked for more than 140 seconds. Not tainted 4.19.133-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29496 25802 25180 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x90e/0xef0 kernel/time/timer.c:1782 __down_common kernel/locking/semaphore.c:221 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:238 down+0x57/0x80 kernel/locking/semaphore.c:62 console_lock+0x25/0x80 kernel/printk/printk.c:2244 do_fb_ioctl+0x33e/0xb50 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1230 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c1d9 Code: 18 0f 57 c0 0f 11 44 24 20 48 c7 44 24 30 64 00 00 00 0f 11 44 24 38 48 89 5c 24 48 e8 c0 dc ff ff 48 8b 44 24 50 48 85 c0 75 <12> 48 8b 8c 24 c8 01 00 00 0f ba e1 00 0f 83 13 01 00 00 48 83 f8 RSP: 002b:00007f9b2e9f5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000c480 RCX: 000000000045c1d9 RDX: 0000000020000080 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007fff9ba2e30f R14: 00007f9b2e9f69c0 R15: 000000000078bf0c INFO: task syz-executor.3:25808 blocked for more than 140 seconds. Not tainted 4.19.133-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29496 25808 25180 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x90e/0xef0 kernel/time/timer.c:1782 __down_common kernel/locking/semaphore.c:221 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:238 down+0x57/0x80 kernel/locking/semaphore.c:62 console_lock+0x25/0x80 kernel/printk/printk.c:2244 do_fb_ioctl+0x33e/0xb50 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1230 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c1d9 Code: 18 0f 57 c0 0f 11 44 24 20 48 c7 44 24 30 64 00 00 00 0f 11 44 24 38 48 89 5c 24 48 e8 c0 dc ff ff 48 8b 44 24 50 48 85 c0 75 <12> 48 8b 8c 24 c8 01 00 00 0f ba e1 00 0f 83 13 01 00 00 48 83 f8 RSP: 002b:00007f9b2e992c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000c480 RCX: 000000000045c1d9 RDX: 0000000020000080 RSI: 0000000000004601 RDI: 0000000000000003 RBP: 000000000078c120 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c0ec R13: 00007fff9ba2e30f R14: 00007f9b2e9939c0 R15: 000000000078c0ec Showing all locks held in the system: 1 lock held by khungtaskd/1082: #0: 000000001be9f4b0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/6143: #0: 000000006bf9aeac (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 5 locks held by syz-executor.0/25075: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1082 Comm: khungtaskd Not tainted 4.19.133-syzkaller #0 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+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 25075 Comm: syz-executor.0 Not tainted 4.19.133-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:vga16fb_fillrect+0x9d4/0x1940 drivers/video/fbdev/vga16fb.c:922 Code: ff 89 de 31 ed e8 7c d2 e3 fd 85 db 4d 89 ec 74 22 e8 00 d1 e3 fd 45 88 34 24 83 c5 01 89 df 49 83 c4 01 89 ee e8 dc d1 e3 fd <39> eb 75 e3 89 d8 49 01 c5 e8 de d0 e3 fd 31 ff 44 89 fe 4c 03 2c RSP: 0018:ffff8880825a7570 EFLAGS: 00000297 RAX: 0000000000000002 RBX: 0000000000000002 RCX: ffffffff8385d7e4 RDX: 0000000000000002 RSI: ffff888047e54700 RDI: 0000000000000004 RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000002 R10: 0000000000000004 R11: 079f07b0072b703f R12: ffff8880000a0002 R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000a5f17c90 FS: 00007f4d4ab1d700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557dfe9d0230 CR3: 0000000093ccd000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins+0x1e2/0x350 drivers/video/fbdev/core/fbcon.c:1342 ypan_up_redraw drivers/video/fbdev/core/fbcon.c:1527 [inline] fbcon_scroll+0xe37/0x3700 drivers/video/fbdev/core/fbcon.c:1905 con_scroll+0x5f8/0x720 drivers/tty/vt/vt.c:637 lf+0x262/0x2b0 drivers/tty/vt/vt.c:1484 do_con_write+0x133e/0x1d90 drivers/tty/vt/vt.c:2761 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3138 process_output_block drivers/tty/n_tty.c:593 [inline] n_tty_write+0x3c0/0xff0 drivers/tty/n_tty.c:2331 do_tty_write drivers/tty/tty_io.c:960 [inline] tty_write+0x496/0x810 drivers/tty/tty_io.c:1044 do_loop_readv_writev fs/read_write.c:704 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_write+0x461/0x5d0 fs/read_write.c:962 vfs_writev+0x153/0x2e0 fs/read_write.c:1005 do_writev+0x136/0x330 fs/read_write.c:1040 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c1d9 Code: 8d b6 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4d4ab1cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000036e00 RCX: 000000000045c1d9 RDX: 0000000000000001 RSI: 00000000200005c0 RDI: 0000000000000005 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007fffd56eb76f R14: 00007f4d4ab1d9c0 R15: 000000000078bf0c