syzbot


general protection fault in __run_timers (3)

Status: auto-closed as invalid on 2020/12/09 00:33
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+514ba2cbb8dc35749cc1@syzkaller.appspotmail.com
First crash: 1378d, last: 1378d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in __run_timers kernel 35 2465d 2486d 0/27 closed as invalid on 2017/10/22 12:45
upstream KMSAN: uninit-value in __run_timers (3) reiserfs C error 4 288d 324d 0/27 auto-obsoleted due to no activity on 2024/01/10 00:11
upstream general protection fault in __run_timers (2) kernel C 5 2125d 2140d 0/27 closed as invalid on 2018/09/05 12:51
android-54 KASAN: use-after-free Write in __run_timers syz 441 13h30m 1438d 0/2 upstream: reported syz repro on 2020/07/11 21:22

Sample crash report:
general protection fault, probably for non-canonical address 0xe001fa0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x000ff00000000018-0x000ff0000000001f]
CPU: 1 PID: 17986 Comm: syz-executor.3 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lookup_object lib/debugobjects.c:197 [inline]
RIP: 0010:debug_object_deactivate lib/debugobjects.c:712 [inline]
RIP: 0010:debug_object_deactivate+0x140/0x300 lib/debugobjects.c:698
Code: 8f 01 00 00 48 8b ab a0 cd b2 8c 31 db 48 85 ed 74 44 49 bc 00 00 00 00 00 fc ff df 48 8d 7d 18 83 c3 01 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 1e 01 00 00 4c 3b 7d 18 74 74 48 89 e8 48 c1
RSP: 0018:ffffc90000da8d28 EFLAGS: 00010006
RAX: 0001fe0000000003 RBX: 0000000000000002 RCX: ffffffff815b5bb0
RDX: 1ffffffff1985463 RSI: 0000000000000082 RDI: 000ff00000000018
RBP: 000ff00000000000 R08: ffffffff8cc2a308 R09: 0000000000000003
R10: fffff520001b5193 R11: 0000000000000001 R12: dffffc0000000000
R13: ffffffff89be2fe0 R14: 1ffff920001b51a7 R15: ffff888058c3cea8
FS:  00007f56940b7700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06974e0db8 CR3: 000000002e641000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 debug_timer_deactivate kernel/time/timer.c:732 [inline]
 debug_deactivate kernel/time/timer.c:781 [inline]
 detach_timer kernel/time/timer.c:826 [inline]
 expire_timers kernel/time/timer.c:1447 [inline]
 __run_timers.part.0+0x51a/0xaa0 kernel/time/timer.c:1755
 __run_timers kernel/time/timer.c:1736 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
 __do_softirq+0x1f7/0xa91 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x235/0x280 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:284
Code: 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 cc fe ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 <48> 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 ae fe ff ff 0f 1f 40 00
RSP: 0018:ffffc900168ff480 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000006
RDX: 0000000000000007 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000106 R08: 00000000ffffffee R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000004
R13: 0000000000000006 R14: ffff8882188d5baf R15: 000000000000001c
 slow_imageblit drivers/video/fbdev/core/cfbimgblt.c:173 [inline]
 cfb_imageblit+0x836/0x1010 drivers/video/fbdev/core/cfbimgblt.c:302
 vga_imageblit_expand drivers/video/fbdev/vga16fb.c:1207 [inline]
 vga16fb_imageblit+0x693/0x2210 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+0x33c/0x3f0 drivers/video/fbdev/core/fbcon.c:1362
 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:675
 csi_J+0x2d5/0xab0 drivers/tty/vt/vt.c:1568
 reset_terminal+0x66b/0x780 drivers/tty/vt/vt.c:2108
 do_con_trol+0x1382/0x51e0 drivers/tty/vt/vt.c:2244
 do_con_write+0xb7f/0x1d70 drivers/tty/vt/vt.c:2906
 con_write+0x22/0xb0 drivers/tty/vt/vt.c:3250
 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: 0033:0x45d5b9
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f56940b6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000038980 RCX: 000000000045d5b9
RDX: 0000000000001006 RSI: 0000000020001440 RDI: 0000000000000004
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 000000000169fb6f R14: 00007f56940b79c0 R15: 000000000118cf4c
Modules linked in:
---[ end trace cc38c3b5e3030344 ]---
RIP: 0010:lookup_object lib/debugobjects.c:197 [inline]
RIP: 0010:debug_object_deactivate lib/debugobjects.c:712 [inline]
RIP: 0010:debug_object_deactivate+0x140/0x300 lib/debugobjects.c:698
Code: 8f 01 00 00 48 8b ab a0 cd b2 8c 31 db 48 85 ed 74 44 49 bc 00 00 00 00 00 fc ff df 48 8d 7d 18 83 c3 01 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 1e 01 00 00 4c 3b 7d 18 74 74 48 89 e8 48 c1
RSP: 0018:ffffc90000da8d28 EFLAGS: 00010006
RAX: 0001fe0000000003 RBX: 0000000000000002 RCX: ffffffff815b5bb0
RDX: 1ffffffff1985463 RSI: 0000000000000082 RDI: 000ff00000000018
RBP: 000ff00000000000 R08: ffffffff8cc2a308 R09: 0000000000000003
R10: fffff520001b5193 R11: 0000000000000001 R12: dffffc0000000000
R13: ffffffff89be2fe0 R14: 1ffff920001b51a7 R15: ffff888058c3cea8
FS:  00007f56940b7700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f06974e0db8 CR3: 000000002e641000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/09/10 00:32 upstream 34d4ddd359db 409809d8 .config console log report ci-upstream-kasan-gce
* Struck through repros no longer work on HEAD.