syzbot


general protection fault in rcu_sync_func (2)
Status: moderation: reported on 2022/03/28 01:18
Reported-by: syzbot+4c620df22e8dddcc9b2e@syzkaller.appspotmail.com
First crash: 64d, last: 64d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in rcu_sync_func 1 1028d 1024d 0/22 auto-closed as invalid on 2019/11/01 16:33
android-54 general protection fault in rcu_sync_func 2 238d 267d 0/2 auto-closed as invalid on 2022/01/28 23:25

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 4723 Comm: syz-executor.4 Tainted: G        W         5.17.0-syzkaller-02237-g1bc191051dca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__wake_up_common+0xdf/0x650 kernel/sched/wait.c:100
Code: 05 00 00 4c 8b 43 40 49 83 e8 18 49 8d 78 18 48 3b 3c 24 0f 84 6a 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80> 3c 01 00 0f 85 40 05 00 00 49 8b 40 18 89 54 24 10 31 db 48 bd
RSP: 0018:ffffc9000a2477b0 EFLAGS: 00010056
RAX: dffffc0000000000 RBX: ffff88807cd8f0c8 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 1ffffffff1b289f5 RDI: 0000000000000000
RBP: ffff88807cd8f118 R08: ffffffffffffffe8 R09: 0000000000000000
R10: fffff52001448ef0 R11: 0000000000000001 R12: ffff88807cd8f0c0
R13: 0000000000000297 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2dc2a000 CR3: 0000000074aea000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 rcu_sync_func+0x119/0x180 kernel/rcu/sync.c:87
 rcu_sync_enter+0x150/0x2e0 kernel/rcu/sync.c:150
 percpu_down_write+0x55/0x320 kernel/locking/percpu-rwsem.c:221
 hci_uart_tty_close+0x162/0x2a0 drivers/bluetooth/hci_ldisc.c:539
 tty_ldisc_close+0x110/0x190 drivers/tty/tty_ldisc.c:456
 tty_ldisc_kill+0x94/0x150 drivers/tty/tty_ldisc.c:608
 tty_ldisc_release+0xe1/0x2a0 drivers/tty/tty_ldisc.c:776
 tty_release_struct+0x20/0xe0 drivers/tty/tty_io.c:1694
 tty_release+0xc70/0x1200 drivers/tty/tty_io.c:1865
 __fput+0x286/0x9f0 fs/file_table.c:317
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xaff/0x2a30 kernel/exit.c:806
 do_group_exit+0xd2/0x2f0 kernel/exit.c:936
 get_signal+0x4b0/0x28c0 kernel/signal.c:2903
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:149 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:187 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:222
 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:315
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f69cf689049
Code: Unable to access opcode bytes at RIP 0x7f69cf68901f.
RSP: 002b:00007f69d071a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f69cf79c1d0 RCX: 00007f69cf689049
RDX: 0000000020000400 RSI: 0000000040047451 RDI: 0000000000000004
RBP: 00007f69cf6e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe09f638ef R14: 00007f69d071a300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__wake_up_common+0xdf/0x650 kernel/sched/wait.c:100
Code: 05 00 00 4c 8b 43 40 49 83 e8 18 49 8d 78 18 48 3b 3c 24 0f 84 6a 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80> 3c 01 00 0f 85 40 05 00 00 49 8b 40 18 89 54 24 10 31 db 48 bd
RSP: 0018:ffffc9000a2477b0 EFLAGS: 00010056
RAX: dffffc0000000000 RBX: ffff88807cd8f0c8 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 1ffffffff1b289f5 RDI: 0000000000000000
RBP: ffff88807cd8f118 R08: ffffffffffffffe8 R09: 0000000000000000
R10: fffff52001448ef0 R11: 0000000000000001 R12: ffff88807cd8f0c0
R13: 0000000000000297 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2dc2a000 CR3: 0000000074aea000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	05 00 00 4c 8b       	add    $0x8b4c0000,%eax
   5:	43                   	rex.XB
   6:	40                   	rex
   7:	49 83 e8 18          	sub    $0x18,%r8
   b:	49 8d 78 18          	lea    0x18(%r8),%rdi
   f:	48 3b 3c 24          	cmp    (%rsp),%rdi
  13:	0f 84 6a 02 00 00    	je     0x283
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 f9             	mov    %rdi,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	80 3c 01 00          	cmpb   $0x0,(%rcx,%rax,1) <-- trapping instruction
  2e:	0f 85 40 05 00 00    	jne    0x574
  34:	49 8b 40 18          	mov    0x18(%r8),%rax
  38:	89 54 24 10          	mov    %edx,0x10(%rsp)
  3c:	31 db                	xor    %ebx,%ebx
  3e:	48                   	rex.W
  3f:	bd                   	.byte 0xbd

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2022/03/24 01:14 upstream 1bc191051dca 5ff41e94 .config log report info general protection fault in rcu_sync_func