INFO: task syz-executor.5:30917 can't die for more than 143 seconds. task:syz-executor.5 state:R running task stack:28256 pid:30917 ppid: 6875 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4785 irqentry_exit_cond_resched kernel/entry/common.c:332 [inline] irqentry_exit_cond_resched kernel/entry/common.c:324 [inline] irqentry_exit+0x65/0x90 kernel/entry/common.c:362 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:vga16fb_fillrect+0x9f0/0x193b drivers/video/fbdev/vga16fb.c:921 Code: 01 89 df 49 83 c4 01 89 ee e8 8c 6a a8 fd 39 eb 75 e3 89 d8 49 01 c5 e8 7e 6e a8 fd 31 ff 44 89 fe 4c 03 2c 24 e8 f0 6a a8 fd <45> 85 ff 41 8d 47 ff 0f 84 86 fc ff ff 41 89 c7 eb a2 e8 b9 7c e8 RSP: 0018:ffffc9000ad3f750 EFLAGS: 00000297 RAX: 0000000000000002 RBX: 0000000000000004 RCX: ffffffff83cc0450 RDX: 00000000655861d5 RSI: ffff88804dde4300 RDI: 0000000000000005 RBP: 0000000000000004 R08: 0000000000000001 R09: 0000000000000020 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880000a0004 R13: ffff8880000a0000 R14: 0000000000000000 R15: 00000000655861d5 bit_clear+0x386/0x4d0 drivers/video/fbdev/core/bitblit.c:74 fbcon_clear+0x519/0x5a0 drivers/video/fbdev/core/fbcon.c:1351 fbcon_scroll+0x1e20/0x3600 drivers/video/fbdev/core/fbcon.c:1980 con_scroll+0x5b9/0x6d0 drivers/tty/vt/vt.c:630 lf+0x26b/0x2c0 drivers/tty/vt/vt.c:1490 vc_con_write_normal drivers/tty/vt/vt.c:2811 [inline] do_con_write+0xedd/0x1d70 drivers/tty/vt/vt.c:2915 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3255 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x3ce/0xf80 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:962 [inline] tty_write+0x4d9/0x870 drivers/tty/tty_io.c:1046 vfs_write+0x2b0/0x730 fs/read_write.c:576 ksys_write+0x12d/0x250 fs/read_write.c:631 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007fa0ffd76c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000038800 RCX: 000000000045d4d9 RDX: 0000000000001006 RSI: 0000000020001440 RDI: 0000000000000006 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffff4239d8f R14: 00007fa0ffd779c0 R15: 000000000118cf4c INFO: task syz-executor.0:30918 can't die for more than 143 seconds. task:syz-executor.0 state:D stack:26952 pid:30918 ppid: 6865 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007f388ea0cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000004 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffc7c74825f R14: 00007f388ea0d9c0 R15: 000000000118cf4c INFO: task syz-executor.0:30918 blocked for more than 143 seconds. Not tainted 5.9.0-rc1-next-20200821-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26952 pid:30918 ppid: 6865 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007f388ea0cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000004 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffc7c74825f R14: 00007f388ea0d9c0 R15: 000000000118cf4c INFO: task syz-executor.4:30920 can't die for more than 143 seconds. task:syz-executor.4 state:D stack:27528 pid:30920 ppid: 6873 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007f1887a84c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000005 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffeb6365c4f R14: 00007f1887a859c0 R15: 000000000118cf4c INFO: task syz-executor.4:30920 blocked for more than 143 seconds. Not tainted 5.9.0-rc1-next-20200821-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27528 pid:30920 ppid: 6873 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007f1887a84c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000005 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffeb6365c4f R14: 00007f1887a859c0 R15: 000000000118cf4c INFO: task syz-executor.4:30925 can't die for more than 143 seconds. task:syz-executor.4 state:D stack:28840 pid:30925 ppid: 6873 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007f1887a63c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000005 RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec R13: 00007ffeb6365c4f R14: 00007f1887a649c0 R15: 000000000118cfec INFO: task syz-executor.4:30925 blocked for more than 143 seconds. Not tainted 5.9.0-rc1-next-20200821-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28840 pid:30925 ppid: 6873 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007f1887a63c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000005 RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec R13: 00007ffeb6365c4f R14: 00007f1887a649c0 R15: 000000000118cfec INFO: task syz-executor.1:30928 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:27496 pid:30928 ppid: 6867 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007ff1af413c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000008 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffe1a776aef R14: 00007ff1af4149c0 R15: 000000000118cf4c INFO: task syz-executor.1:30928 blocked for more than 143 seconds. Not tainted 5.9.0-rc1-next-20200821-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27496 pid:30928 ppid: 6867 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007ff1af413c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000008 RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffe1a776aef R14: 00007ff1af4149c0 R15: 000000000118cf4c INFO: task syz-executor.1:30931 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:29848 pid:30931 ppid: 6867 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007ff1af3b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000008 RBP: 000000000118d160 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d12c R13: 00007ffe1a776aef R14: 00007ff1af3b19c0 R15: 000000000118d12c INFO: task syz-executor.1:30931 blocked for more than 143 seconds. Not tainted 5.9.0-rc1-next-20200821-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:29848 pid:30931 ppid: 6867 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 __down_common kernel/locking/semaphore.c:220 [inline] __down+0x183/0x2a0 kernel/locking/semaphore.c:237 down+0x57/0x80 kernel/locking/semaphore.c:61 console_lock+0x25/0x80 kernel/printk/printk.c:2357 do_fb_ioctl+0x2e4/0x690 drivers/video/fbdev/core/fbmem.c:1102 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1181 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d4d9 Code: Bad RIP value. RSP: 002b:00007ff1af3b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000e240 RCX: 000000000045d4d9 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000008 RBP: 000000000118d160 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d12c R13: 00007ffe1a776aef R14: 00007ff1af3b19c0 R15: 000000000118d12c Showing all locks held in the system: 1 lock held by khungtaskd/1164: #0: ffffffff89c675c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5825 1 lock held by systemd-journal/3903: 1 lock held by in:imklog/6535: 2 locks held by agetty/6748: #0: ffff888094094098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000f842e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 2 locks held by agetty/6749: #0: ffff8880a6058098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000f702e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 2 locks held by agetty/6753: #0: ffff888091820098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000fc02e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 5 locks held by syz-executor.5/30917: 2 locks held by kworker/1:2/30964: #0: ffff8880ae735dd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #0: ffff8880ae735dd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x232/0x21e0 kernel/sched/core.c:4445 #1: ffff8880ae720ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2fb/0x400 kernel/sched/psi.c:833 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1164 Comm: khungtaskd Not tainted 5.9.0-rc1-next-20200821-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6535 Comm: in:imklog Not tainted 5.9.0-rc1-next-20200821-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_memory_region+0xe/0x180 mm/kasan/generic.c:191 Code: f5 00 00 00 e9 d3 7c 03 02 0f 1f 00 48 89 f2 be f8 00 00 00 e9 c3 7c 03 02 0f 1f 00 48 85 f6 0f 84 70 01 00 00 49 89 f9 41 54 <44> 0f b6 c2 49 01 f1 55 53 0f 82 18 01 00 00 48 b8 ff ff ff ff ff RSP: 0018:ffffc9000aa4f628 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 000000000000001e RCX: ffffffff815a07fe RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8c68d9e0 RBP: ffff88809e4a4aa8 R08: 0000000000000000 R09: ffffffff8c68d9e0 R10: fffffbfff18d1b3c R11: 0000000000000000 R12: 0000000000000000 R13: ffff88809e4a4aca R14: ffff88809e4a4140 R15: 0000000000000000 FS: 00007f8538ee0700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f853baa8000 CR3: 000000009a4fa000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] __lock_acquire+0xfbe/0x5640 kernel/locking/lockdep.c:4396 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005 seqcount_lockdep_reader_access include/linux/seqlock.h:102 [inline] read_seqcount_t_begin include/linux/seqlock.h:311 [inline] read_seqbegin include/linux/seqlock.h:752 [inline] zone_span_seqbegin include/linux/memory_hotplug.h:80 [inline] page_outside_zone_boundaries+0xbb/0x310 mm/page_alloc.c:561 bad_range mm/page_alloc.c:590 [inline] __free_one_page+0x118/0xd70 mm/page_alloc.c:973 free_one_page+0x79/0x1b0 mm/page_alloc.c:1387 __free_pages_ok+0x43c/0xc90 mm/page_alloc.c:1477 slab_destroy mm/slab.c:1625 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1641 cache_flusharray mm/slab.c:3405 [inline] ___cache_free+0x510/0x740 mm/slab.c:3455 qlink_free mm/kasan/quarantine.c:149 [inline] qlist_free_all+0x98/0x160 mm/kasan/quarantine.c:168 quarantine_reduce+0x17e/0x200 mm/kasan/quarantine.c:261 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:442 slab_post_alloc_hook mm/slab.h:517 [inline] slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc_trace+0x137/0x2c0 mm/slab.c:3548 kmalloc include/linux/slab.h:554 [inline] syslog_print+0xa3/0x510 kernel/printk/printk.c:1440 do_syslog.part.0+0x2bb/0x8d0 kernel/printk/printk.c:1596 do_syslog+0x49/0x60 kernel/printk/printk.c:1577 kmsg_read+0x90/0xb0 fs/proc/kmsg.c:40 pde_read fs/proc/inode.c:306 [inline] proc_reg_read+0x119/0x300 fs/proc/inode.c:316 vfs_read+0x1df/0x5a0 fs/read_write.c:479 ksys_read+0x12d/0x250 fs/read_write.c:607 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f853b52322d Code: c1 20 00 00 75 10 b8 00 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 97 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f8538ebf580 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f853b52322d RDX: 0000000000001fa0 RSI: 00007f8538ebfda0 RDI: 0000000000000004 RBP: 000055b85d33f9d0 R08: 0000000000000000 R09: 0000000000000000 R10: 2ce33e6c02ce33e7 R11: 0000000000000293 R12: 00007f8538ebfda0 R13: 0000000000001fa0 R14: 0000000000001f9f R15: 00007f8538ec1d23