syzbot


kernel panic: corrupted stack end in syscall_exit_to_user_mode

Status: auto-obsoleted due to no activity on 2023/04/12 19:05
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+694d875fe9906819aec8@syzkaller.appspotmail.com
First crash: 495d, last: 495d

Sample crash report:
Kernel panic - not syncing: corrupted stack end detected inside scheduler
CPU: 0 PID: 6063 Comm: syz-executor.0 Not tainted 6.2.0-rc7-next-20230208-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 panic+0x61b/0x6c0 kernel/panic.c:319
 schedule_debug kernel/sched/core.c:5862 [inline]
 __schedule+0x5953/0x5a60 kernel/sched/core.c:6513
 preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:6931
 irqentry_exit+0x35/0x80 kernel/entry/common.c:433
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:stack_not_used include/linux/sched/task_stack.h:107 [inline]
RIP: 0010:check_stack_usage kernel/exit.c:772 [inline]
RIP: 0010:do_exit+0x18af/0x2b60 kernel/exit.c:913
Code: 00 fc ff df 4c 8b 6d 20 4c 89 ed e8 1b f5 36 00 48 83 c5 08 48 89 e8 48 c1 e8 03 42 80 3c 30 00 0f 85 2f 0d 00 00 4c 8b 65 00 <31> ff 4c 89 e6 e8 67 f1 36 00 4d 85 e4 74 d2 e8 ed f4 36 00 4c 63
RSP: 0018:ffffc90014affc18 EFLAGS: 00000246
RAX: 1ffff9200295f001 RBX: ffff888085770000 RCX: 0000000000000000
RDX: ffff888085770000 RSI: ffffffff814d78c5 RDI: ffff888085770020
RBP: ffffc90014af8008 R08: 0000000000000005 R09: 0000000000000008
R10: 0000000000000008 R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90014af8000 R14: dffffc0000000000 R15: ffff8880857705f8
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1019
 get_signal+0x2321/0x25b0 kernel/signal.c:2859
 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 ret_from_fork+0x15/0x30 arch/x86/entry/entry_64.S:301
RIP: 0033:0x7efce288d521
Code: Unable to access opcode bytes at 0x7efce288d4f7.
RSP: 002b:00007efce35992f0 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: 0000000000000000 RBX: 00007efce3599700 RCX: 00007efce288d521
RDX: 00007efce35999d0 RSI: 00007efce35992f0 RDI: 00000000003d0f00
RBP: 00007ffda04ab050 R08: 00007efce3599700 R09: 00007efce3599700
R10: 00007efce35999d0 R11: 0000000000000206 R12: 00007ffda04aaebe
R13: 00007ffda04aaebf R14: 00007efce3599300 R15: 0000000000022000
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	df 4c 8b 6d          	fisttps 0x6d(%rbx,%rcx,4)
   4:	20 4c 89 ed          	and    %cl,-0x13(%rcx,%rcx,4)
   8:	e8 1b f5 36 00       	callq  0x36f528
   d:	48 83 c5 08          	add    $0x8,%rbp
  11:	48 89 e8             	mov    %rbp,%rax
  14:	48 c1 e8 03          	shr    $0x3,%rax
  18:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1)
  1d:	0f 85 2f 0d 00 00    	jne    0xd52
  23:	4c 8b 65 00          	mov    0x0(%rbp),%r12
* 27:	31 ff                	xor    %edi,%edi <-- trapping instruction
  29:	4c 89 e6             	mov    %r12,%rsi
  2c:	e8 67 f1 36 00       	callq  0x36f198
  31:	4d 85 e4             	test   %r12,%r12
  34:	74 d2                	je     0x8
  36:	e8 ed f4 36 00       	callq  0x36f528
  3b:	4c                   	rex.WR
  3c:	63                   	.byte 0x63

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/11 19:05 linux-next 38d2b86a665b 93e26d60 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel panic: corrupted stack end in syscall_exit_to_user_mode
* Struck through repros no longer work on HEAD.