Re: [syzbot] BUG: sleeping function called from invalid context in blk_mq_release

From: Dmitry Vyukov
Date: Fri Apr 01 2022 - 02:40:22 EST

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On Fri, 1 Apr 2022 at 00:04, syzbot
<syzbot+d17750670998d5d4f5ec@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 787af64d05cd mm: page_alloc: validate buddy before check i..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=109c0687700000
> kernel config: https://syzkaller.appspot.com/x/.config?x=3daed5742799b46b
> dashboard link: https://syzkaller.appspot.com/bug?extid=d17750670998d5d4f5ec
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d17750670998d5d4f5ec@xxxxxxxxxxxxxxxxxxxxxxxxx

#syz fix: block: avoid calling blkg_free() in atomic context

> BUG: sleeping function called from invalid context at block/blk-sysfs.c:766
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3123, name: udevd
> preempt_count: 100, expected: 0
> RCU nest depth: 2, expected: 0
> 4 locks held by udevd/3123:
> #0: ffffffff8c592858 (tomoyo_ss){....}-{0:0}, at: tomoyo_check_open_permission+0xe8/0x380 security/tomoyo/file.c:761
> #1: ffffffff8bd7f3e0 (rcu_read_lock){....}-{1:2}, at: prepend_path+0x0/0xea0 fs/d_path.c:368
> #2: ffffffff8bd7f3e0 (rcu_read_lock){....}-{1:2}, at: need_seqretry include/linux/seqlock.h:1158 [inline]
> #2: ffffffff8bd7f3e0 (rcu_read_lock){....}-{1:2}, at: prepend_path+0x25f/0xea0 fs/d_path.c:182
> #3: ffffffff8bd7f2c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2524 [inline]
> #3: ffffffff8bd7f2c0 (rcu_callback){....}-{0:0}, at: rcu_core+0x73d/0x1880 kernel/rcu/tree.c:2786
> <IRQ>
> kobject_cleanup lib/kobject.c:705 [inline]
> kobject_release lib/kobject.c:736 [inline]
> kref_put include/linux/kref.h:65 [inline]
> kobject_put+0x1c8/0x540 lib/kobject.c:753
> blkg_free.part.0+0x112/0x1f0 block/blk-cgroup.c:86
> blkg_free block/blk-cgroup.c:78 [inline]
> __blkg_release+0x105/0x160 block/blk-cgroup.c:102
> rcu_do_batch kernel/rcu/tree.c:2535 [inline]
> rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2786
> __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
> invoke_softirq kernel/softirq.c:432 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
> sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
> </IRQ>
> <TASK>
> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645
> RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
> RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
> RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
> Code: 48 89 ef 5d e9 f1 90 4a 00 5d be 03 00 00 00 e9 36 66 74 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 c9 a2 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
> RSP: 0018:ffffc900030ff5c8 EFLAGS: 00000293
> RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
> RDX: ffff888021002280 RSI: ffffffff81df460e RDI: 0000000000000003
> RBP: ffffc900030ff6d8 R08: 0000000000000000 R09: 0000000000000001
> R10: ffffffff81df4604 R11: 0000000000000001 R12: 0000000000000000
> R13: ffff88801ab435d0 R14: dffffc0000000000 R15: dffffc0000000000
> __seqprop_spinlock_sequence include/linux/seqlock.h:277 [inline]
> read_seqbegin include/linux/seqlock.h:840 [inline]
> read_seqbegin_or_lock include/linux/seqlock.h:1144 [inline]
> prepend_path+0x3b4/0xea0 fs/d_path.c:170
> d_absolute_path+0xef/0x1a0 fs/d_path.c:233
> tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline]
> tomoyo_file_open+0x9d/0xc0 security/tomoyo/tomoyo.c:306
> security_file_open+0x45/0xb0 security/security.c:1651
> do_dentry_open+0x349/0x11e0 fs/open.c:811
> do_open fs/namei.c:3476 [inline]
> path_openat+0x1c71/0x2910 fs/namei.c:3609
> do_filp_open+0x1aa/0x400 fs/namei.c:3636
> do_sys_openat2+0x16d/0x4c0 fs/open.c:1213
> do_sys_open fs/open.c:1229 [inline]
> __do_sys_openat fs/open.c:1245 [inline]
> __se_sys_openat fs/open.c:1240 [inline]
> __x64_sys_openat+0x13f/0x1f0 fs/open.c:1240
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x7fa17d125697
> Code: 25 00 00 41 00 3d 00 00 41 00 74 37 64 8b 04 25 18 00 00 00 85 c0 75 5b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f
> RSP: 002b:00007ffeed1068f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
> RAX: ffffffffffffffda RBX: 0000564cae660160 RCX: 00007fa17d125697
> RDX: 0000000000080000 RSI: 00007ffeed106a28 RDI: 00000000ffffff9c
> RBP: 00007ffeed106a28 R08: 0000000000000008 R09: 0000000000000001
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000
> R13: 0000564cae660160 R14: 0000000000000001 R15: 0000000000000000
> </TASK>
>
> ================================
> WARNING: inconsistent lock state
> 5.17.0-syzkaller-13430-g787af64d05cd #0 Tainted: G W
> --------------------------------
> inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
> udevd/3123 [HC0[0]:SC1[1]:HE0:SE0] takes:
> ffff8880140d2160 (&xa->xa_lock#8){+.?.}-{2:2}, at: xa_destroy+0xb3/0x360 lib/xarray.c:2207
> {SOFTIRQ-ON-W} state was registered at:
> lock_acquire kernel/locking/lockdep.c:5641 [inline]
> lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
> __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
> _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
> spin_lock include/linux/spinlock.h:349 [inline]
> xa_insert include/linux/xarray.h:772 [inline]
> blk_mq_init_hctx block/blk-mq.c:3501 [inline]
> blk_mq_alloc_and_init_hctx+0x52d/0x1190 block/blk-mq.c:3962
> blk_mq_realloc_hw_ctxs+0x43d/0x590 block/blk-mq.c:3991
> blk_mq_init_allocated_queue+0x457/0x13d0 block/blk-mq.c:4053
> blk_mq_init_queue_data block/blk-mq.c:3906 [inline]
> __blk_mq_alloc_disk+0xd1/0x1c0 block/blk-mq.c:3926
> floppy_alloc_disk+0x3d/0x390 drivers/block/floppy.c:4495
> do_floppy_init drivers/block/floppy.c:4576 [inline]
> floppy_async_init+0x316/0x21ca drivers/block/floppy.c:4746
> async_run_entry_fn+0x9d/0x550 kernel/async.c:127
> process_one_work+0x996/0x1610 kernel/workqueue.c:2289
> worker_thread+0x665/0x1080 kernel/workqueue.c:2436
> softirqs last enabled at (20583496): [<ffffffff8146ca53>] invoke_softirq kernel/softirq.c:432 [inline]
> softirqs last enabled at (20583496): [<ffffffff8146ca53>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
> softirqs last disabled at (20587107): [<ffffffff8146ca53>] invoke_softirq kernel/softirq.c:432 [inline]
> softirqs last disabled at (20587107): [<ffffffff8146ca53>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
>
> other info that might help us debug this:
> Possible unsafe locking scenario:
>
> CPU0
> ----
> lock(&xa->xa_lock#8);
> <Interrupt>
>
> *** DEADLOCK ***
>
> #0: ffffffff8c592858 (tomoyo_ss){....}-{0:0}, at: tomoyo_check_open_permission+0xe8/0x380 security/tomoyo/file.c:761
> #2: ffffffff8bd7f3e0 (rcu_read_lock){....}-{1:2}, at: need_seqretry include/linux/seqlock.h:1158 [inline]
> #2: ffffffff8bd7f3e0 (rcu_read_lock){....}-{1:2}, at: prepend_path+0x25f/0xea0 fs/d_path.c:182
>
> stack backtrace:
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> print_usage_bug kernel/locking/lockdep.c:3935 [inline]
> valid_state kernel/locking/lockdep.c:3947 [inline]
> mark_lock_irq kernel/locking/lockdep.c:4150 [inline]
> mark_lock.part.0.cold+0x18/0xd8 kernel/locking/lockdep.c:4607
> mark_lock kernel/locking/lockdep.c:4571 [inline]
> mark_usage kernel/locking/lockdep.c:4502 [inline]
> __lock_acquire+0x11e7/0x56c0 kernel/locking/lockdep.c:4983
> lock_acquire kernel/locking/lockdep.c:5641 [inline]
> lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5606
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
> blk_mq_release+0x2b1/0x3e0 block/blk-mq.c:3887
> blk_release_queue+0x15b/0x320 block/blk-sysfs.c:780
> blkg_free.part.0+0x112/0x1f0 block/blk-cgroup.c:86
> blkg_free block/blk-cgroup.c:78 [inline]
> __blkg_release+0x105/0x160 block/blk-cgroup.c:102
> rcu_do_batch kernel/rcu/tree.c:2535 [inline]
> rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2786
> __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
> invoke_softirq kernel/softirq.c:432 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
> sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
> </IRQ>
> <TASK>
> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645
> RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
> RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
> RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
> Code: 48 89 ef 5d e9 f1 90 4a 00 5d be 03 00 00 00 e9 36 66 74 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 c9 a2 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
> RSP: 0018:ffffc900030ff5c8 EFLAGS: 00000293
> RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
> RDX: ffff888021002280 RSI: ffffffff81df460e RDI: 0000000000000003
> RBP: ffffc900030ff6d8 R08: 0000000000000000 R09: 0000000000000001
> R10: ffffffff81df4604 R11: 0000000000000001 R12: 0000000000000000
> R13: ffff88801ab435d0 R14: dffffc0000000000 R15: dffffc0000000000
> __seqprop_spinlock_sequence include/linux/seqlock.h:277 [inline]
> read_seqbegin include/linux/seqlock.h:840 [inline]
> read_seqbegin_or_lock include/linux/seqlock.h:1144 [inline]
> prepend_path+0x3b4/0xea0 fs/d_path.c:170
> d_absolute_path+0xef/0x1a0 fs/d_path.c:233
> tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
> tomoyo_check_open_permission+0x272/0x380 security/tomoyo/file.c:771
> tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline]
> tomoyo_file_open+0x9d/0xc0 security/tomoyo/tomoyo.c:306
> do_dentry_open+0x349/0x11e0 fs/open.c:811
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80
> RIP: 0033:0x7fa17d125697
> RSP: 002b:00007ffeed1068f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
> BUG: sleeping function called from invalid context at kernel/locking/mutex.c:577
> INFO: lockdep is turned off.
> Preemption disabled at:
> [<ffffffff89a000e1>] softirq_handle_begin kernel/softirq.c:396 [inline]
> [<ffffffff89a000e1>] __do_softirq+0xe1/0x9c2 kernel/softirq.c:534
> CPU: 0 PID: 3123 Comm: udevd Tainted: G W 5.17.0-syzkaller-13430-g787af64d05cd #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> __might_resched.cold+0x222/0x26b kernel/sched/core.c:9733
> blk_trace_shutdown+0x1d/0x100 kernel/trace/blktrace.c:773
> kobject_cleanup lib/kobject.c:705 [inline]
> kobject_release lib/kobject.c:736 [inline]
> kref_put include/linux/kref.h:65 [inline]
> kobject_put+0x1c8/0x540 lib/kobject.c:753
> blkg_free.part.0+0x112/0x1f0 block/blk-cgroup.c:86
> blkg_free block/blk-cgroup.c:78 [inline]
> __blkg_release+0x105/0x160 block/blk-cgroup.c:102
> rcu_do_batch kernel/rcu/tree.c:2535 [inline]
> rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2786
> __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
> invoke_softirq kernel/softirq.c:432 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
> sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
> </IRQ>
> <TASK>
> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645
> RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
> RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
> RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
> Code: 48 89 ef 5d e9 f1 90 4a 00 5d be 03 00 00 00 e9 36 66 74 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 c9 a2 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
> RSP: 0018:ffffc900030ff5c8 EFLAGS: 00000293
> RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
> RDX: ffff888021002280 RSI: ffffffff81df460e RDI: 0000000000000003
> RBP: ffffc900030ff6d8 R08: 0000000000000000 R09: 0000000000000001
> R10: ffffffff81df4604 R11: 0000000000000001 R12: 0000000000000000
> R13: ffff88801ab435d0 R14: dffffc0000000000 R15: dffffc0000000000
> __seqprop_spinlock_sequence include/linux/seqlock.h:277 [inline]
> read_seqbegin include/linux/seqlock.h:840 [inline]
> read_seqbegin_or_lock include/linux/seqlock.h:1144 [inline]
> prepend_path+0x3b4/0xea0 fs/d_path.c:170
> d_absolute_path+0xef/0x1a0 fs/d_path.c:233
> tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline]
> tomoyo_realpath_from_path+0x288/0x620 security/tomoyo/realpath.c:276
> tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
> tomoyo_check_open_permission+0x272/0x380 security/tomoyo/file.c:771
> tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline]
> tomoyo_file_open+0x9d/0xc0 security/tomoyo/tomoyo.c:306
> security_file_open+0x45/0xb0 security/security.c:1651
> do_dentry_open+0x349/0x11e0 fs/open.c:811
> do_open fs/namei.c:3476 [inline]
> path_openat+0x1c71/0x2910 fs/namei.c:3609
> do_filp_open+0x1aa/0x400 fs/namei.c:3636
> do_sys_openat2+0x16d/0x4c0 fs/open.c:1213
> do_sys_open fs/open.c:1229 [inline]
> __do_sys_openat fs/open.c:1245 [inline]
> __se_sys_openat fs/open.c:1240 [inline]
> __x64_sys_openat+0x13f/0x1f0 fs/open.c:1240
> RIP: 0033:0x7fa17d125697
> RAX: ffffffffffffffda RBX: 0000564cae660160 RCX: 00007fa17d125697
> R13: 0000564cae660160 R14: 0000000000000001 R15: 0000000000000000
> </TASK>
> BUG: sleeping function called from invalid context at block/blk-sysfs.c:766
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/0
> preempt_count: 101, expected: 0
> RCU nest depth: 0, expected: 0
> INFO: lockdep is turned off.
> Preemption disabled at:
> [<ffffffff895f3be9>] schedule_preempt_disabled+0x19/0x20 kernel/sched/core.c:6514
> CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.17.0-syzkaller-13430-g787af64d05cd #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> __might_resched.cold+0x222/0x26b kernel/sched/core.c:9733
> blk_release_queue+0x1f/0x320 block/blk-sysfs.c:766
> kobject_cleanup lib/kobject.c:705 [inline]
> kobject_release lib/kobject.c:736 [inline]
> kref_put include/linux/kref.h:65 [inline]
> kobject_put+0x1c8/0x540 lib/kobject.c:753
> blkg_free.part.0+0x112/0x1f0 block/blk-cgroup.c:86
> blkg_free block/blk-cgroup.c:78 [inline]
> __blkg_release+0x105/0x160 block/blk-cgroup.c:102
> rcu_do_batch kernel/rcu/tree.c:2535 [inline]
> rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2786
> __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
> invoke_softirq kernel/softirq.c:432 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
> sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
> </IRQ>
> <TASK>
> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645
> RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:734
> Code: ff ff ff 48 89 df e8 d4 78 62 f8 e9 55 ff ff ff 4c 89 e7 e8 c7 78 62 f8 eb 96 0f 1f 44 00 00 eb 07 0f 00 2d d7 24 66 00 fb f4 <c3> cc cc cc cc 41 55 41 54 55 48 89 fd 53 e8 12 68 17 f8 e8 6d 1d
> RSP: 0018:ffffffff8ba07e40 EFLAGS: 00000246
> RAX: 00000000000ff8da RBX: ffffffff8babc700 RCX: ffffffff895d77c1
> RDX: ffffed1005947603 RSI: 0000000000000001 RDI: ffffffff8960688f
> RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88802ca3b013
> R10: ffffed1005947602 R11: 0000000000000000 R12: fffffbfff17578e0
> R13: 0000000000000000 R14: ffffffff8db63990 R15: 0000000000000000
> default_idle_call+0x87/0xd0 kernel/sched/idle.c:109
> cpuidle_idle_call kernel/sched/idle.c:191 [inline]
> do_idle+0x401/0x590 kernel/sched/idle.c:303
> secondary_startup_64_no_verify+0xc3/0xcb
> ----------------
> Code disassembly (best guess):
> 0: 48 89 ef mov %rbp,%rdi
> 3: 5d pop %rbp
> 4: e9 f1 90 4a 00 jmpq 0x4a90fa
> 9: 5d pop %rbp
> a: be 03 00 00 00 mov $0x3,%esi
> f: e9 36 66 74 02 jmpq 0x274664a
> 14: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
> 1a: 48 8b be a8 01 00 00 mov 0x1a8(%rsi),%rdi
> 21: e8 b4 ff ff ff callq 0xffffffda
> 26: 31 c0 xor %eax,%eax
> 28: c3 retq
> 29: 90 nop
> * 2a: 65 8b 05 c9 a2 8a 7e mov %gs:0x7e8aa2c9(%rip),%eax # 0x7e8aa2fa <-- trapping instruction
> 31: 89 c1 mov %eax,%ecx
> 33: 48 8b 34 24 mov (%rsp),%rsi
> 37: 81 e1 00 01 00 00 and $0x100,%ecx
> 3d: 65 gs
> 3e: 48 rex.W
> 3f: 8b .byte 0x8b
>
>
> ---
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> See https://goo.gl/tpsmEJ for more information about syzbot.
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>
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