BUG: unable to handle page fault for address: ffffc9001bdbfd88 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 10800067 P4D 10800067 PUD 109ba067 PMD 136067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 19707 Comm: syz-executor.1 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__rb_change_child include/linux/rbtree_augmented.h:173 [inline] RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:216 [inline] RIP: 0010:rb_erase+0x5f6/0x1210 lib/rbtree.c:443 Code: e3 fc 0f 84 0c 01 00 00 48 8d 7b 10 48 89 dd 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 84 0a 00 00 <4c> 3b 6b 10 0f 84 37 02 00 00 48 8d 7b 08 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90000007d88 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: ffffc9001bdbfd78 RCX: 0000000000000000 RDX: 1ffff920037b7fb1 RSI: ffff8880b9c424d0 RDI: ffffc9001bdbfd88 RBP: ffffc9001bdbfd78 R08: ffffc9001bdbfd79 R09: 0000000000000001 R10: ffffffff83f38fdc R11: 0000000000000000 R12: ffffc9001bdbfd79 R13: ffffc9000256fd78 R14: ffffc9001aa2fd78 R15: ffff8880b9c424d0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0063) knlGS:00000000f55b7b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: ffffc9001bdbfd88 CR3: 000000008b5d9000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rb_erase_cached include/linux/rbtree.h:126 [inline] timerqueue_del+0x7f/0x140 lib/timerqueue.c:57 __remove_hrtimer+0xa1/0x2a0 kernel/time/hrtimer.c:1116 __run_hrtimer kernel/time/hrtimer.c:1665 [inline] __hrtimer_run_queues+0x4ea/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xc/0x70 kernel/kcov.c:283 Code: 00 00 00 48 89 7c 30 e8 48 89 4c 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 41 89 f8 bf 03 00 00 00 4c 8b 14 24 <89> f1 65 48 8b 34 25 40 f0 01 00 e8 54 f0 ff ff 84 c0 74 4b 48 8b RSP: 0018:ffffc90019797440 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880001373e4 RCX: 0000000000000000 RDX: 0000000000000003 RSI: 0000000000000004 RDI: 0000000000000003 RBP: ffff8881407c547c R08: 0000000000000000 R09: ffffffff840a6804 R10: ffffffff840a69c5 R11: 0000000000000008 R12: 0000000000000004 R13: 0000000000000047 R14: ffff8880001373e0 R15: dffffc0000000000 fast_imageblit drivers/video/fbdev/core/cfbimgblt.c:258 [inline] cfb_imageblit+0x655/0x1240 drivers/video/fbdev/core/cfbimgblt.c:300 vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1207 [inline] vga16fb_imageblit+0x681/0x2200 drivers/video/fbdev/vga16fb.c:1260 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x6e1/0xd20 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x35a/0x450 drivers/video/fbdev/core/fbcon.c:1296 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:676 redraw_screen+0x61f/0x740 drivers/tty/vt/vt.c:1035 vc_do_resize+0xe6f/0x1100 drivers/tty/vt/vt.c:1325 fbcon_modechanged+0x393/0x6d0 drivers/video/fbdev/core/fbcon.c:2640 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:2696 do_fb_ioctl+0x62e/0x690 drivers/video/fbdev/core/fbmem.c:1108 fb_compat_ioctl+0x17e/0x610 drivers/video/fbdev/core/fbmem.c:1307 __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:964 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fbd549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f55b75fc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601 RDX: 0000000020000280 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: ffffc9001bdbfd88 ---[ end trace 573584e01bd36498 ]--- RIP: 0010:__rb_change_child include/linux/rbtree_augmented.h:173 [inline] RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:216 [inline] RIP: 0010:rb_erase+0x5f6/0x1210 lib/rbtree.c:443 Code: e3 fc 0f 84 0c 01 00 00 48 8d 7b 10 48 89 dd 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 84 0a 00 00 <4c> 3b 6b 10 0f 84 37 02 00 00 48 8d 7b 08 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90000007d88 EFLAGS: 00010046 RAX: dffffc0000000000 RBX: ffffc9001bdbfd78 RCX: 0000000000000000 RDX: 1ffff920037b7fb1 RSI: ffff8880b9c424d0 RDI: ffffc9001bdbfd88 RBP: ffffc9001bdbfd78 R08: ffffc9001bdbfd79 R09: 0000000000000001 R10: ffffffff83f38fdc R11: 0000000000000000 R12: ffffc9001bdbfd79 R13: ffffc9000256fd78 R14: ffffc9001aa2fd78 R15: ffff8880b9c424d0 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0063) knlGS:00000000f55b7b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: ffffc9001bdbfd88 CR3: 000000008b5d9000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e3 fc jrcxz 0xfffffffe 2: 0f 84 0c 01 00 00 je 0x114 8: 48 8d 7b 10 lea 0x10(%rbx),%rdi c: 48 89 dd mov %rbx,%rbp f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 48 89 fa mov %rdi,%rdx 1c: 48 c1 ea 03 shr $0x3,%rdx 20: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 24: 0f 85 84 0a 00 00 jne 0xaae * 2a: 4c 3b 6b 10 cmp 0x10(%rbx),%r13 <-- trapping instruction 2e: 0f 84 37 02 00 00 je 0x26b 34: 48 8d 7b 08 lea 0x8(%rbx),%rdi 38: 48 rex.W 39: b8 00 00 00 00 mov $0x0,%eax 3e: 00 fc add %bh,%ah