INFO: task syz-executor.3:19753 can't die for more than 143 seconds. syz-executor.3 D29808 19753 7111 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] do_fb_ioctl+0x3bf/0x6c0 drivers/video/fbdev/core/fbmem.c:1117 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f4c1aeadc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000ce80 RCX: 000000000045c1d9 RDX: 0000000020000200 RSI: 0000000000004602 RDI: 0000000000000004 RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007fff92be50cf R14: 00007f4c1aeae9c0 R15: 000000000078bfac INFO: task syz-executor.3:19753 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29808 19753 7111 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] do_fb_ioctl+0x3bf/0x6c0 drivers/video/fbdev/core/fbmem.c:1117 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007f4c1aeadc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000ce80 RCX: 000000000045c1d9 RDX: 0000000020000200 RSI: 0000000000004602 RDI: 0000000000000004 RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007fff92be50cf R14: 00007f4c1aeae9c0 R15: 000000000078bfac INFO: task syz-executor.0:19751 can't die for more than 143 seconds. syz-executor.0 R running task 27832 19751 6813 0x00004006 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4427 idtentry_exit_cond_resched arch/x86/entry/common.c:663 [inline] idtentry_exit_cond_rcu+0xc0/0xf0 arch/x86/entry/common.c:710 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587 RIP: 0010:__sanitizer_cov_trace_cmp4+0x4/0x20 kernel/kcov.c:258 Code: 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 4c ff ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <89> f2 89 fe bf 04 00 00 00 e9 2e ff ff ff 0f 1f 40 00 66 2e 0f 1f RSP: 0018:ffffc9000551f5a8 EFLAGS: 00000282 RAX: 0000000000040000 RBX: 0000000000000002 RCX: ffffffff83c86f64 RDX: 0000000000040000 RSI: 0000000000000002 RDI: 0000000000000002 RBP: 0000000000000002 R08: 0000000000000001 R09: ffff8882192b065f R10: 0000000000000002 R11: 0000000000000000 R12: ffff8880000a0002 R13: ffff8880000a0000 R14: 0000000000000000 R15: 000000006a29b0b3 vga16fb_fillrect+0x9d4/0x193b drivers/video/fbdev/vga16fb.c:922 bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins+0x1d5/0x230 drivers/video/fbdev/core/fbcon.c:1381 fbcon_switch+0xb6f/0x16c0 drivers/video/fbdev/core/fbcon.c:2363 redraw_screen+0x2af/0x770 drivers/tty/vt/vt.c:1020 fbcon_modechanged+0x575/0x710 drivers/video/fbdev/core/fbcon.c:3001 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048 fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056 do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185 vfs_ioctl fs/ioctl.c:48 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:753 __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl fs/ioctl.c:760 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007ff92cee1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000ce80 RCX: 000000000045c1d9 RDX: 0000000020000200 RSI: 0000000000004601 RDI: 0000000000000004 RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffe56ce4b7f R14: 00007ff92cee29c0 R15: 000000000078bf0c INFO: task syz-executor.0:19778 can't die for more than 143 seconds. syz-executor.0 D28728 19778 6813 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1b97/0x2720 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16d/0x3e0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007ff92cec0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000020880 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bfe8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffe56ce4b7f R14: 00007ff92cec19c0 R15: 000000000078bfac INFO: task syz-executor.0:19778 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28728 19778 6813 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1b97/0x2720 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16d/0x3e0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007ff92cec0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000020880 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bfe8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffe56ce4b7f R14: 00007ff92cec19c0 R15: 000000000078bfac INFO: task syz-executor.1:19759 can't die for more than 143 seconds. syz-executor.1 D28728 19759 6937 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1b97/0x2720 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16d/0x3e0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007fdebcb7cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000020880 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffcc0c9708f R14: 00007fdebcb7d9c0 R15: 000000000078bf0c INFO: task syz-executor.1:19759 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28728 19759 6937 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1b97/0x2720 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16d/0x3e0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007fdebcb7cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000020880 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00007ffcc0c9708f R14: 00007fdebcb7d9c0 R15: 000000000078bf0c INFO: task syz-executor.1:19761 can't die for more than 143 seconds. syz-executor.1 D28728 19761 6937 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1b97/0x2720 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16d/0x3e0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007fdebcb5bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000020880 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bfe8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffcc0c9708f R14: 00007fdebcb5c9c0 R15: 000000000078bfac INFO: task syz-executor.1:19761 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28728 19761 6937 0x00000004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4303 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103 lock_fb_info include/linux/fb.h:638 [inline] fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4b9/0x11b0 fs/open.c:822 do_open fs/namei.c:3249 [inline] path_openat+0x1b97/0x2720 fs/namei.c:3366 do_filp_open+0x17e/0x3c0 fs/namei.c:3393 do_sys_openat2+0x16d/0x3e0 fs/open.c:1173 do_sys_open fs/open.c:1189 [inline] __do_sys_openat fs/open.c:1203 [inline] __se_sys_openat fs/open.c:1198 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1198 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c1d9 Code: Bad RIP value. RSP: 002b:00007fdebcb5bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000020880 RCX: 000000000045c1d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 000000000078bfe8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffcc0c9708f R14: 00007fdebcb5c9c0 R15: 000000000078bfac Showing all locks held in the system: 1 lock held by khungtaskd/1149: #0: ffffffff89c53980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6511: #0: ffff88809f1c1d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 1 lock held by syz-executor.0/8656: #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline] #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: fb_release+0x4e/0x140 drivers/video/fbdev/core/fbmem.c:1447 1 lock held by syz-executor.1/10997: #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline] #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: fb_release+0x4e/0x140 drivers/video/fbdev/core/fbmem.c:1447 1 lock held by systemd-udevd/15040: 1 lock held by syz-executor.3/19753: #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline] #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: do_fb_ioctl+0x3bf/0x6c0 drivers/video/fbdev/core/fbmem.c:1117 2 locks held by syz-executor.0/19751: 1 lock held by syz-executor.0/19778: #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline] #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 1 lock held by syz-executor.1/19759: #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline] #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 1 lock held by syz-executor.1/19761: #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: lock_fb_info include/linux/fb.h:638 [inline] #0: ffff88821887c078 (&fb_info->lock){+.+.}-{3:3}, at: fb_open+0xd3/0x430 drivers/video/fbdev/core/fbmem.c:1418 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1149 Comm: khungtaskd Not tainted 5.8.0-rc5-next-20200716-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: 15040 Comm: systemd-udevd Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x55/0x60 kernel/kcov.c:207 Code: 82 e8 13 00 00 83 f8 02 75 20 48 8b 8a f0 13 00 00 8b 92 ec 13 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 66 2e 0f 1f 84 00 00 00 00 00 41 55 41 54 49 89 fc 55 48 bd eb RSP: 0018:ffffc900085878f8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000010 RCX: ffffffff8364985a RDX: ffff88805be5a0c0 RSI: ffffffff83649628 RDI: 0000000000000001 RBP: ffff8880a81a9500 R08: 0000000000000001 R09: ffffffff8cbbf5a7 R10: 0000000000000010 R11: 0000000000000000 R12: 0000000000000026 R13: 00000000000000e1 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007f048754f8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bd98f79738 CR3: 0000000091550000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tomoyo_domain_quota_is_ok+0xf8/0x550 security/tomoyo/util.c:1032 tomoyo_supervisor+0x2d4/0xeb0 security/tomoyo/common.c:2089 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline] tomoyo_path_number_perm+0x3ed/0x4d0 security/tomoyo/file.c:734 security_path_chmod+0xe0/0x150 security/security.c:1160 chmod_common+0x156/0x3f0 fs/open.c:588 ksys_fchmod+0xc4/0x130 fs/open.c:612 __do_sys_fchmod fs/open.c:620 [inline] __se_sys_fchmod fs/open.c:618 [inline] __x64_sys_fchmod+0x53/0x80 fs/open.c:618 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f04863c25c7 Code: Bad RIP value. RSP: 002b:00007ffd7def9998 EFLAGS: 00000213 ORIG_RAX: 000000000000005b RAX: ffffffffffffffda RBX: 0000000000000124 RCX: 00007f04863c25c7 RDX: 0000000000000124 RSI: 0000000000000124 RDI: 0000000000000007 RBP: 0000000000000007 R08: 000000000000c0c0 R09: 000055bd96efc248 R10: 00007ffd7def99c0 R11: 0000000000000213 R12: 0000000000000018 R13: 00007ffd7def99c0 R14: 000055bd96ef77b0 R15: 000000000000000e