syzbot


BUG: soft lockup in msr_write

Status: closed as invalid on 2022/04/26 07:32
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 223d, last: 223d

Sample crash report:
watchdog: BUG: soft lockup - CPU#1 stuck for 3513328309s! [syz-executor.3:2097]
Modules linked in:
irq event stamp: 3837950
hardirqs last  enabled at (3837949): [<ffffffff813a0062>] _flat_send_IPI_mask+0xf2/0x190 arch/x86/kernel/apic/apic_flat_64.c:57
hardirqs last disabled at (3837950): [<ffffffff8a186dfa>] sysvec_apic_timer_interrupt+0xa/0xb0 arch/x86/kernel/apic/apic.c:1097
softirqs last  enabled at (293974): [<ffffffff8150f6dc>] __irq_exit_rcu+0xec/0x170 kernel/softirq.c:637
softirqs last disabled at (293887): [<ffffffff8150f6dc>] __irq_exit_rcu+0xec/0x170 kernel/softirq.c:637
CPU: 1 PID: 2097 Comm: syz-executor.3 Tainted: G S                5.18.0-rc3-syzkaller-00196-g45ab9400e73f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:msr_write+0x21f/0x330 arch/x86/kernel/msr.c:139
Code: 04 2c 84 c0 75 3f 8b 5c 24 60 48 8b 44 24 28 42 0f b6 04 28 84 c0 75 48 8b 4c 24 64 44 89 ff 8b 74 24 14 89 da e8 31 18 23 03 <85> c0 4c 8b 6c 24 30 75 55 49 83 c6 08 4c 39 74 24 18 48 8d 7c 24
RSP: 0018:ffffc900102e7bc0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000c0fb000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: ffffc900102e7c90 R08: ffffffff845ae4b9 R09: ffffed10173475a1
R10: ffffed10173475a1 R11: 1ffff110173475a0 R12: 1ffff9200205cf84
R13: dffffc0000000000 R14: 0000000000e75098 R15: 0000000000000000
FS:  00007f4580340700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020e75000 CR3: 0000000020206000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_iter_write+0x4ed/0x7a0 fs/read_write.c:854
 vfs_writev fs/read_write.c:925 [inline]
 do_pwritev+0x219/0x360 fs/read_write.c:1022
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f457f2890e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4580340168 EFLAGS: 00000246 ORIG_RAX: 0000000000000128
RAX: ffffffffffffffda RBX: 00007f457f39bf60 RCX: 00007f457f2890e9
RDX: 0000000000000002 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 00007f457f2e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000010 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd8063794f R14: 00007f4580340300 R15: 0000000000022000
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8650 Comm: kworker/u4:9 Tainted: G S                5.18.0-rc3-syzkaller-00196-g45ab9400e73f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:411 [inline]
RIP: 0010:smp_call_function_many_cond+0xf17/0x1500 kernel/smp.c:969
Code: fe 83 e6 01 31 ff e8 58 3e 0c 00 41 83 e7 01 49 bf 00 00 00 00 00 fc ff df 75 08 e8 23 3a 0c 00 eb 46 90 f3 90 42 0f b6 04 3b <84> c0 75 11 41 f7 04 24 01 00 00 00 74 2b e8 06 3a 0c 00 eb e4 44
RSP: 0018:ffffc9001516f780 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff11017367d39 RCX: ffff88801ff41d80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9001516f940 R08: ffffffff8179c4d8 R09: fffffbfff1f61df9
R10: fffffbfff1f61df9 R11: 1ffffffff1f61df8 R12: ffff8880b9b3e9c8
R13: 1ffff11017347598 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc78c7691b8 CR3: 000000000c88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1184 [inline]
 text_poke_bp_batch+0x31d/0x960 arch/x86/kernel/alternative.c:1372
 text_poke_flush arch/x86/kernel/alternative.c:1542 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1549
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 static_key_disable_cpuslocked+0xc8/0x1b0 kernel/jump_label.c:207
 static_key_disable+0x16/0x20 kernel/jump_label.c:215
 toggle_allocation_gate+0x3d8/0x470 mm/kfence/core.c:778
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>
----------------
Code disassembly (best guess):
   0:	04 2c                	add    $0x2c,%al
   2:	84 c0                	test   %al,%al
   4:	75 3f                	jne    0x45
   6:	8b 5c 24 60          	mov    0x60(%rsp),%ebx
   a:	48 8b 44 24 28       	mov    0x28(%rsp),%rax
   f:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
  14:	84 c0                	test   %al,%al
  16:	75 48                	jne    0x60
  18:	8b 4c 24 64          	mov    0x64(%rsp),%ecx
  1c:	44 89 ff             	mov    %r15d,%edi
  1f:	8b 74 24 14          	mov    0x14(%rsp),%esi
  23:	89 da                	mov    %ebx,%edx
  25:	e8 31 18 23 03       	callq  0x323185b
* 2a:	85 c0                	test   %eax,%eax <-- trapping instruction
  2c:	4c 8b 6c 24 30       	mov    0x30(%rsp),%r13
  31:	75 55                	jne    0x88
  33:	49 83 c6 08          	add    $0x8,%r14
  37:	4c 39 74 24 18       	cmp    %r14,0x18(%rsp)
  3c:	48                   	rex.W
  3d:	8d                   	.byte 0x8d
  3e:	7c 24                	jl     0x64

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2022/04/23 17:21 upstream 45ab9400e73f 131df97d .config log report info BUG: soft lockup in msr_write
* Struck through repros no longer work on HEAD.