syzbot
inconsistent lock state in mmc_free_host
Status:
upstream: reported C repro on 2026/08/29 02:06
Reported-by: syzbot+62a07768328a4ba2b4a6@syzkaller.appspotmail.com
First crash: 3d07h, last: 1d11h
Sample crash report:
================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
syz-execprog/4285 [HC0[0]:SC1[1]:HE1:SE0] takes:
ffff88807303c648 ((work_completion)(&(&host->detect)->work)){+.?.}-{0:0}, at: __flush_work+0x109/0xac0 kernel/workqueue.c:3072
{SOFTIRQ-ON-W} state was registered at:
lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
__flush_work+0x122/0xac0 kernel/workqueue.c:3072
__cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3163
__mmc_stop_host drivers/mmc/core/core.c:2303 [inline]
mmc_stop_host+0xd5/0x460 drivers/mmc/core/core.c:2308
mmc_remove_host+0x11/0x60 drivers/mmc/core/host.c:651
vub300_disconnect+0x14b/0x2e0 drivers/mmc/host/vub300.c:2388
usb_unbind_interface+0x203/0x870 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:549 [inline]
__device_release_driver drivers/base/dd.c:1279 [inline]
device_release_driver_internal+0x4cf/0x7c0 drivers/base/dd.c:1305
bus_remove_device+0x2dd/0x400 drivers/base/bus.c:531
device_del+0x63f/0xa80 drivers/base/core.c:3900
usb_disable_device+0x3e7/0x8a0 drivers/usb/core/message.c:1472
usb_disconnect+0x33c/0x8a0 drivers/usb/core/hub.c:2314
hub_port_connect drivers/usb/core/hub.c:5361 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5657 [inline]
port_event drivers/usb/core/hub.c:5817 [inline]
hub_event+0x1d27/0x5200 drivers/usb/core/hub.c:5899
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
process_scheduled_works kernel/workqueue.c:2355 [inline]
worker_thread+0xd6e/0x12a0 kernel/workqueue.c:2441
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
irq event stamp: 446120
hardirqs last enabled at (446120): [<ffffffff815473aa>] __cancel_work_timer+0x36a/0x560 kernel/workqueue.c:3156
hardirqs last disabled at (446119): [<ffffffff81543d4a>] try_to_grab_pending+0xfa/0x890 kernel/workqueue.c:1267
softirqs last enabled at (438970): [<ffffffff814f49cb>] __do_softirq kernel/softirq.c:630 [inline]
softirqs last enabled at (438970): [<ffffffff814f49cb>] invoke_softirq kernel/softirq.c:470 [inline]
softirqs last enabled at (438970): [<ffffffff814f49cb>] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
softirqs last disabled at (446055): [<ffffffff814f49cb>] __do_softirq kernel/softirq.c:630 [inline]
softirqs last disabled at (446055): [<ffffffff814f49cb>] invoke_softirq kernel/softirq.c:470 [inline]
softirqs last disabled at (446055): [<ffffffff814f49cb>] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock((work_completion)(&(&host->detect)->work));
<Interrupt>
lock((work_completion)(&(&host->detect)->work));
*** DEADLOCK ***
3 locks held by syz-execprog/4285:
#0: ffff8880301bd3d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline]
#0: ffff8880301bd3d8 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0x177/0x970 mm/mmap.c:3235
#1: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#1: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#1: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x1e/0x2a0 mm/page_ext.c:157
#2: ffffc90000007bc0 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xcf/0x670 kernel/time/timer.c:1698
stack backtrace:
CPU: 0 PID: 4285 Comm: syz-execprog Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<IRQ>
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
valid_state+0x13b/0x1d0 kernel/locking/lockdep.c:3974
mark_lock_irq+0xa9/0x900 kernel/locking/lockdep.c:4177
mark_lock+0x208/0x320 kernel/locking/lockdep.c:4633
mark_usage kernel/locking/lockdep.c:-1 [inline]
__lock_acquire+0xce0/0x7c40 kernel/locking/lockdep.c:5017
lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
__flush_work+0x122/0xac0 kernel/workqueue.c:3072
__cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3163
mmc_free_host+0x15/0x30 drivers/mmc/core/host.c:672
call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x56c/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x291/0x910 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:unwind_next_frame+0x1613/0x1fd0 arch/x86/kernel/unwind_orc.c:621
Code: 00 49 0f bf 07 48 01 c6 48 89 df 4c 89 f2 e8 d4 09 00 00 84 c0 0f 84 36 01 00 00 49 bd 00 00 00 00 00 fc ff df 48 8b 44 24 10 <42> 0f b6 04 28 84 c0 0f 85 89 06 00 00 8b 44 24 64 39 03 48 8d 7b
RSP: 0018:ffffc90003ed6e80 EFLAGS: 00000202
RAX: 1ffff920007dade5 RBX: ffffc90003ed6f28 RCX: 0000000000000001
RDX: ffffc90003ed6f68 RSI: dffffc0000000000 RDI: ffffc90003ed7460
RBP: dffffc0000000000 R08: ffffc90003ed7460 R09: ffffc90003ed6f78
R10: dffffc0000000000 R11: fffff520007dadf1 R12: ffffffff8eaa4e73
R13: dffffc0000000000 R14: ffffc90003ed6f60 R15: ffffffff8eaa4e72
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
save_stack+0x121/0x230 mm/page_owner.c:127
__reset_page_owner+0x51/0x190 mm/page_owner.c:148
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1487 [inline]
free_pcp_prepare mm/page_alloc.c:1537 [inline]
free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3555
release_pages+0x20d1/0x2340 mm/swap.c:1035
tlb_batch_pages_flush mm/mmu_gather.c:60 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:255 [inline]
tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:262
zap_pte_range mm/memory.c:1523 [inline]
zap_pmd_range mm/memory.c:1572 [inline]
zap_pud_range mm/memory.c:1601 [inline]
zap_p4d_range mm/memory.c:1622 [inline]
unmap_page_range+0x2037/0x25b0 mm/memory.c:1643
unmap_vmas+0x260/0x390 mm/memory.c:1728
exit_mmap+0x20d/0x970 mm/mmap.c:3250
__mmput+0x118/0x3a0 kernel/fork.c:1210
exit_mm+0x24d/0x350 kernel/exit.c:572
do_exit+0x958/0x2570 kernel/exit.c:874
do_group_exit+0x229/0x2e0 kernel/exit.c:1030
get_signal+0x1259/0x1340 kernel/signal.c:2880
arch_do_signal_or_restart+0xc4/0x1310 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x493e43
Code: Unable to access opcode bytes at 0x493e19.
RSP: 002b:00003cbbbda51cd8 EFLAGS: 00000286 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000493e43
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00003cbbbda3b160
RBP: 00003cbbbda51d20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 00003cbbbda51d30
R13: 00003cbbc4a57180 R14: 00003cbbbd9cad20 R15: ffffffffffffffff
</TASK>
BUG: sleeping function called from invalid context at kernel/workqueue.c:3013
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4285, name: syz-execprog
preempt_count: 101, expected: 0
RCU nest depth: 1, expected: 0
INFO: lockdep is turned off.
Preemption disabled at:
[<ffffffff8138fb37>] unwind_next_frame+0x97/0x1fd0 arch/x86/kernel/unwind_orc.c:433
CPU: 0 PID: 4285 Comm: syz-execprog Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<IRQ>
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
__might_resched+0x489/0x5f0 kernel/sched/core.c:9970
start_flush_work kernel/workqueue.c:3013 [inline]
__flush_work+0x142/0xac0 kernel/workqueue.c:3075
__cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3163
mmc_free_host+0x15/0x30 drivers/mmc/core/host.c:672
call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x56c/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x291/0x910 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:unwind_next_frame+0x1613/0x1fd0 arch/x86/kernel/unwind_orc.c:621
Code: 00 49 0f bf 07 48 01 c6 48 89 df 4c 89 f2 e8 d4 09 00 00 84 c0 0f 84 36 01 00 00 49 bd 00 00 00 00 00 fc ff df 48 8b 44 24 10 <42> 0f b6 04 28 84 c0 0f 85 89 06 00 00 8b 44 24 64 39 03 48 8d 7b
RSP: 0018:ffffc90003ed6e80 EFLAGS: 00000202
RAX: 1ffff920007dade5 RBX: ffffc90003ed6f28 RCX: 0000000000000001
RDX: ffffc90003ed6f68 RSI: dffffc0000000000 RDI: ffffc90003ed7460
RBP: dffffc0000000000 R08: ffffc90003ed7460 R09: ffffc90003ed6f78
R10: dffffc0000000000 R11: fffff520007dadf1 R12: ffffffff8eaa4e73
R13: dffffc0000000000 R14: ffffc90003ed6f60 R15: ffffffff8eaa4e72
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
save_stack+0x121/0x230 mm/page_owner.c:127
__reset_page_owner+0x51/0x190 mm/page_owner.c:148
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1487 [inline]
free_pcp_prepare mm/page_alloc.c:1537 [inline]
free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3555
release_pages+0x20d1/0x2340 mm/swap.c:1035
tlb_batch_pages_flush mm/mmu_gather.c:60 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:255 [inline]
tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:262
zap_pte_range mm/memory.c:1523 [inline]
zap_pmd_range mm/memory.c:1572 [inline]
zap_pud_range mm/memory.c:1601 [inline]
zap_p4d_range mm/memory.c:1622 [inline]
unmap_page_range+0x2037/0x25b0 mm/memory.c:1643
unmap_vmas+0x260/0x390 mm/memory.c:1728
exit_mmap+0x20d/0x970 mm/mmap.c:3250
__mmput+0x118/0x3a0 kernel/fork.c:1210
exit_mm+0x24d/0x350 kernel/exit.c:572
do_exit+0x958/0x2570 kernel/exit.c:874
do_group_exit+0x229/0x2e0 kernel/exit.c:1030
get_signal+0x1259/0x1340 kernel/signal.c:2880
arch_do_signal_or_restart+0xc4/0x1310 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x493e43
Code: Unable to access opcode bytes at 0x493e19.
RSP: 002b:00003cbbbda51cd8 EFLAGS: 00000286 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000493e43
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00003cbbbda3b160
RBP: 00003cbbbda51d20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 00003cbbbda51d30
R13: 00003cbbc4a57180 R14: 00003cbbbd9cad20 R15: ffffffffffffffff
</TASK>
ODEBUG: object ffffc900000079a0 is NOT on stack ffffc90003ed0000, but annotated.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4285 at lib/debugobjects.c:558 debug_object_is_on_stack lib/debugobjects.c:-1 [inline]
WARNING: CPU: 0 PID: 4285 at lib/debugobjects.c:558 lookup_object_or_alloc lib/debugobjects.c:591 [inline]
WARNING: CPU: 0 PID: 4285 at lib/debugobjects.c:558 __debug_object_init+0x18e/0x440 lib/debugobjects.c:672
Modules linked in:
CPU: 0 PID: 4285 Comm: syz-execprog Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:debug_object_is_on_stack lib/debugobjects.c:558 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:591 [inline]
RIP: 0010:__debug_object_init+0x18e/0x440 lib/debugobjects.c:672
Code: 24 04 74 2f 41 ff c6 44 89 35 de 03 de 12 48 c7 c1 c0 6a df 8a 48 c7 c7 20 6b df 8a 84 c0 48 0f 45 f9 48 89 de e8 72 83 0b 06 <0f> 0b eb 05 4c 8b 7c 24 18 4d 8d 65 10 4d 89 e6 49 c1 ee 03 41 0f
RSP: 0018:ffffc90000007908 EFLAGS: 00010046
RAX: 0000000000000050 RBX: ffffc900000079a0 RCX: a5beeff94e5c7f00
RDX: 0000000000000100 RSI: 0000000000000102 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffc90000007587 R09: 1ffff92000000eb0
R10: dffffc0000000000 R11: fffff52000000eb1 R12: ffff888030171e20
R13: ffff8880255e6038 R14: 0000000000000001 R15: ffffffff8a8d30a0
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00003cbbc4a2c000 CR3: 000000000c88e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__synchronize_srcu+0x227/0x350 kernel/rcu/srcutree.c:1241
wakeup_source_remove drivers/base/power/wakeup.c:198 [inline]
wakeup_source_unregister+0x112/0x190 drivers/base/power/wakeup.c:242
mmc_host_classdev_release+0x43/0xf0 drivers/mmc/core/host.c:77
device_release+0x92/0x1c0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:681 [inline]
kobject_release lib/kobject.c:712 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x217/0x450 lib/kobject.c:729
call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x56c/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x291/0x910 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:unwind_next_frame+0x1613/0x1fd0 arch/x86/kernel/unwind_orc.c:621
Code: 00 49 0f bf 07 48 01 c6 48 89 df 4c 89 f2 e8 d4 09 00 00 84 c0 0f 84 36 01 00 00 49 bd 00 00 00 00 00 fc ff df 48 8b 44 24 10 <42> 0f b6 04 28 84 c0 0f 85 89 06 00 00 8b 44 24 64 39 03 48 8d 7b
RSP: 0018:ffffc90003ed6e80 EFLAGS: 00000202
RAX: 1ffff920007dade5 RBX: ffffc90003ed6f28 RCX: 0000000000000001
RDX: ffffc90003ed6f68 RSI: dffffc0000000000 RDI: ffffc90003ed7460
RBP: dffffc0000000000 R08: ffffc90003ed7460 R09: ffffc90003ed6f78
R10: dffffc0000000000 R11: fffff520007dadf1 R12: ffffffff8eaa4e73
R13: dffffc0000000000 R14: ffffc90003ed6f60 R15: ffffffff8eaa4e72
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
save_stack+0x121/0x230 mm/page_owner.c:127
__reset_page_owner+0x51/0x190 mm/page_owner.c:148
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1487 [inline]
free_pcp_prepare mm/page_alloc.c:1537 [inline]
free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3555
release_pages+0x20d1/0x2340 mm/swap.c:1035
tlb_batch_pages_flush mm/mmu_gather.c:60 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:255 [inline]
tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:262
zap_pte_range mm/memory.c:1523 [inline]
zap_pmd_range mm/memory.c:1572 [inline]
zap_pud_range mm/memory.c:1601 [inline]
zap_p4d_range mm/memory.c:1622 [inline]
unmap_page_range+0x2037/0x25b0 mm/memory.c:1643
unmap_vmas+0x260/0x390 mm/memory.c:1728
exit_mmap+0x20d/0x970 mm/mmap.c:3250
__mmput+0x118/0x3a0 kernel/fork.c:1210
exit_mm+0x24d/0x350 kernel/exit.c:572
do_exit+0x958/0x2570 kernel/exit.c:874
do_group_exit+0x229/0x2e0 kernel/exit.c:1030
get_signal+0x1259/0x1340 kernel/signal.c:2880
arch_do_signal_or_restart+0xc4/0x1310 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x493e43
Code: Unable to access opcode bytes at 0x493e19.
RSP: 002b:00003cbbbda51cd8 EFLAGS: 00000286 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000493e43
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00003cbbbda3b160
RBP: 00003cbbbda51d20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 00003cbbbda51d30
R13: 00003cbbc4a57180 R14: 00003cbbbd9cad20 R15: ffffffffffffffff
</TASK>
----------------
Code disassembly (best guess):
0: 00 49 0f add %cl,0xf(%rcx)
3: bf 07 48 01 c6 mov $0xc6014807,%edi
8: 48 89 df mov %rbx,%rdi
b: 4c 89 f2 mov %r14,%rdx
e: e8 d4 09 00 00 call 0x9e7
13: 84 c0 test %al,%al
15: 0f 84 36 01 00 00 je 0x151
1b: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
22: fc ff df
25: 48 8b 44 24 10 mov 0x10(%rsp),%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 89 06 00 00 jne 0x6c0
37: 8b 44 24 64 mov 0x64(%rsp),%eax
3b: 39 03 cmp %eax,(%rbx)
3d: 48 rex.W
3e: 8d .byte 0x8d
3f: 7b .byte 0x7b
Struck through repros no longer work on HEAD.