syzbot


WARNING: suspicious RCU usage in usb_tx_block

Status: upstream: reported on 2026/03/08 22:54
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+602b46de41ef3a75dfb3@syzkaller.appspotmail.com
First crash: 8d05h, last: 5d22h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [mm?] WARNING: suspicious RCU usage in usb_tx_block 0 (1) 2026/03/08 22:54

Sample crash report:
=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
kernel/sched/core.c:8846 Illegal context switch in RCU-sched read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
8 locks held by syz-executor/16541:
 #0: ffffffff898137d0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1529 [inline]
 #0: ffffffff898137d0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1582 [inline]
 #0: ffffffff898137d0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x4594/0x7800 kernel/fork.c:2223
 #1: ffff888114e4cb40 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
 #1: ffff888114e4cb40 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x11f/0x1f30 mm/mmap.c:1740
 #2: ffff88811c64b340 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:544 [inline]
 #2: ffff88811c64b340 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x1ba/0x1f30 mm/mmap.c:1747
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x300 mm/pgtable-generic.c:288
 #4: ffff8881356161f8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}
, at: spin_lock include/linux/spinlock.h:341 [inline]
, at: pte_offset_map_lock+0x10f/0x320 mm/pgtable-generic.c:402
 #5: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #5: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #5: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x300 mm/pgtable-generic.c:288
 #6: ffff88813be78978 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pte_range mm/memory.c:1269 [inline]
 #6: ffff88813be78978 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pmd_range mm/memory.c:1405 [inline]
 #6: ffff88813be78978 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pud_range mm/memory.c:1442 [inline]
 #6: ffff88813be78978 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_p4d_range mm/memory.c:1466 [inline]
 #6: ffff88813be78978 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_page_range+0xc75/0x2630 mm/memory.c:1552
 #7: ffffffff896e04e0 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #7: ffffffff896e04e0 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:948 [inline]
 #7: ffffffff896e04e0 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2197 [inline]
 #7: ffffffff896e04e0 (rcu_read_lock_sched){....}-{1:2}, at: page_table_check_set+0x4f/0xa10 mm/page_table_check.c:105

stack backtrace:
CPU: 0 UID: 0 PID: 16541 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 lockdep_rcu_suspicious.cold+0x4f/0xb1 kernel/locking/lockdep.c:6876
 __might_resched+0x2e0/0x330 kernel/sched/core.c:8846
 usb_kill_urb+0x8e/0x320 drivers/usb/core/urb.c:705
 usb_tx_block+0x91/0x320 drivers/net/wireless/marvell/libertas/if_usb.c:429
 if_usb_send_fw_pkt.isra.0+0x2e4/0x550 drivers/net/wireless/marvell/libertas/if_usb.c:366
 if_usb_receive_fwload+0x5d3/0x780 drivers/net/wireless/marvell/libertas/if_usb.c:592
 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
 dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x50e/0xa70 kernel/time/hrtimer.c:1849
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1866
 handle_softirqs+0x1de/0x9d0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:213
Code: 5a 00 be 03 00 00 00 5b e9 e2 26 1a 01 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 25 16 43 0b <48> 8b 34 24 65 48 8b 15 01 16 43 0b a9 00 01 ff 00 74 1b f6 c4 01
RSP: 0018:ffffc9001495f398 EFLAGS: 00000202
RAX: 0000000080000003 RBX: 00000000001475a1 RCX: ffffffff821a7c7e
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88811632ba00
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
 rcu_read_unlock_sched include/linux/rcupdate.h:970 [inline]
 pfn_valid include/linux/mmzone.h:2207 [inline]
 page_table_check_set+0x86d/0xa10 mm/page_table_check.c:105
 __page_table_check_ptes_set+0x1db/0x230 mm/page_table_check.c:215
 page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
 set_ptes include/linux/pgtable.h:413 [inline]
 __copy_present_ptes mm/memory.c:1115 [inline]
 copy_present_ptes+0xcc4/0x4590 mm/memory.c:1194
 copy_pte_range mm/memory.c:1317 [inline]
 copy_pmd_range mm/memory.c:1405 [inline]
 copy_pud_range mm/memory.c:1442 [inline]
 copy_p4d_range mm/memory.c:1466 [inline]
 copy_page_range+0xe45/0x2630 mm/memory.c:1552
 dup_mmap+0xcb9/0x1f30 mm/mmap.c:1841
 dup_mm kernel/fork.c:1530 [inline]
 copy_mm kernel/fork.c:1582 [inline]
 copy_process+0x459f/0x7800 kernel/fork.c:2223
 kernel_clone+0xfc/0x9a0 kernel/fork.c:2654
 __do_sys_clone+0xd9/0x120 kernel/fork.c:2795
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0x7b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e86fc5212
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fff99746eb0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff99746eb0 RCX: 00007f3e86fc5212
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff9974703c R08: 0000000000000000 R09: 0000000000000001
R10: 00005555833b67d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000301ae6 R15: 00007fff99747090
 </TASK>
BUG: sleeping function called from invalid context at drivers/usb/core/urb.c:705
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 16541, name: syz-executor
preempt_count: 103, expected: 0
RCU nest depth: 2, expected: 0
8 locks held by syz-executor/16541:
 #0: 
ffffffff898137d0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1529 [inline]
ffffffff898137d0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1582 [inline]
ffffffff898137d0 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x4594/0x7800 kernel/fork.c:2223
 #1: ffff888114e4cb40 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
 #1: ffff888114e4cb40 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x11f/0x1f30 mm/mmap.c:1740
 #2: 
ffff88811c64b340 (&mm->mmap_lock
/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:544 [inline]
/1){+.+.}-{4:4}, at: dup_mmap+0x1ba/0x1f30 mm/mmap.c:1747
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x300 mm/pgtable-generic.c:288
 #4: ffff8881356161f8 (ptlock_ptr(ptdesc)
#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x10f/0x320 mm/pgtable-generic.c:402
 #5: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #5: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #5: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x300 mm/pgtable-generic.c:288
 #6: ffff88813be78978 (ptlock_ptr(ptdesc)
#2/1){+.+.}-{3:3}
, at: copy_pte_range mm/memory.c:1269 [inline]
, at: copy_pmd_range mm/memory.c:1405 [inline]
, at: copy_pud_range mm/memory.c:1442 [inline]
, at: copy_p4d_range mm/memory.c:1466 [inline]
, at: copy_page_range+0xc75/0x2630 mm/memory.c:1552
 #7: ffffffff896e04e0 (rcu_read_lock_sched){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
, at: rcu_read_lock_sched include/linux/rcupdate.h:948 [inline]
, at: pfn_valid include/linux/mmzone.h:2197 [inline]
, at: page_table_check_set+0x4f/0xa10 mm/page_table_check.c:105
irq event stamp: 4986957
hardirqs last  enabled at (4986956): [<ffffffff876b20b2>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last  enabled at (4986956): [<ffffffff876b20b2>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (4986957): [<ffffffff876b1dc2>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (4986957): [<ffffffff876b1dc2>] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162
softirqs last  enabled at (4986950): [<ffffffff8176f0bd>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (4986950): [<ffffffff8176f0bd>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (4986950): [<ffffffff8176f0bd>] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
softirqs last disabled at (4986953): [<ffffffff8176f0bd>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (4986953): [<ffffffff8176f0bd>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (4986953): [<ffffffff8176f0bd>] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 UID: 0 PID: 16541 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 __might_resched.cold+0x1ec/0x232 kernel/sched/core.c:8884
 usb_kill_urb+0x8e/0x320 drivers/usb/core/urb.c:705
 usb_tx_block+0x91/0x320 drivers/net/wireless/marvell/libertas/if_usb.c:429
 if_usb_send_fw_pkt.isra.0+0x2e4/0x550 drivers/net/wireless/marvell/libertas/if_usb.c:366
 if_usb_receive_fwload+0x5d3/0x780 drivers/net/wireless/marvell/libertas/if_usb.c:592
 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
 dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x50e/0xa70 kernel/time/hrtimer.c:1849
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1866
 handle_softirqs+0x1de/0x9d0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:213
Code: 5a 00 be 03 00 00 00 5b e9 e2 26 1a 01 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 25 16 43 0b <48> 8b 34 24 65 48 8b 15 01 16 43 0b a9 00 01 ff 00 74 1b f6 c4 01
RSP: 0018:ffffc9001495f398 EFLAGS: 00000202
RAX: 0000000080000003 RBX: 00000000001475a1 RCX: ffffffff821a7c7e
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88811632ba00
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000000
 rcu_read_unlock_sched include/linux/rcupdate.h:970 [inline]
 pfn_valid include/linux/mmzone.h:2207 [inline]
 page_table_check_set+0x86d/0xa10 mm/page_table_check.c:105
 __page_table_check_ptes_set+0x1db/0x230 mm/page_table_check.c:215
 page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
 set_ptes include/linux/pgtable.h:413 [inline]
 __copy_present_ptes mm/memory.c:1115 [inline]
 copy_present_ptes+0xcc4/0x4590 mm/memory.c:1194
 copy_pte_range mm/memory.c:1317 [inline]
 copy_pmd_range mm/memory.c:1405 [inline]
 copy_pud_range mm/memory.c:1442 [inline]
 copy_p4d_range mm/memory.c:1466 [inline]
 copy_page_range+0xe45/0x2630 mm/memory.c:1552
 dup_mmap+0xcb9/0x1f30 mm/mmap.c:1841
 dup_mm kernel/fork.c:1530 [inline]
 copy_mm kernel/fork.c:1582 [inline]
 copy_process+0x459f/0x7800 kernel/fork.c:2223
 kernel_clone+0xfc/0x9a0 kernel/fork.c:2654
 __do_sys_clone+0xd9/0x120 kernel/fork.c:2795
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0x7b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e86fc5212
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007fff99746eb0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fff99746eb0 RCX: 00007f3e86fc5212
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007fff9974703c R08: 0000000000000000 R09: 0000000000000001
R10: 00005555833b67d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 0000000000301ae6 R15: 00007fff99747090
 </TASK>
BUG: scheduling while atomic: syz-executor/16541/0x00000104
8 locks held by syz-executor/16541:
 #0: ffffffff898137d0
 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1529 [inline]
 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm kernel/fork.c:1582 [inline]
 (dup_mmap_sem){.+.+}-{0:0}, at: copy_process+0x4594/0x7800 kernel/fork.c:2223
 #1: ffff888114e4cb40 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
 #1: ffff888114e4cb40 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x11f/0x1f30 mm/mmap.c:1740
 #2: ffff88811c64b340 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:544 [inline]
 #2: ffff88811c64b340 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x1ba/0x1f30 mm/mmap.c:1747
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
 #3: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x300 mm/pgtable-generic.c:288
 #4: ffff8881356161f8 (ptlock_ptr(ptdesc)#2
){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:341 [inline]
){+.+.}-{3:3}, at: pte_offset_map_lock+0x10f/0x320 mm/pgtable-generic.c:402
 #5: ffffffff896e05a0 (rcu_read_lock){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
, at: __pte_offset_map+0x2f/0x300 mm/pgtable-generic.c:288
 #6: 
ffff88813be78978
 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}
, at: copy_pte_range mm/memory.c:1269 [inline]
, at: copy_pmd_range mm/memory.c:1405 [inline]
, at: copy_pud_range mm/memory.c:1442 [inline]
, at: copy_p4d_range mm/memory.c:1466 [inline]
, at: copy_page_range+0xc75/0x2630 mm/memory.c:1552
 #7: ffffffff896e04e0 (rcu_read_lock_sched
){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:948 [inline]
){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2197 [inline]
){....}-{1:2}, at: page_table_check_set+0x4f/0xa10 mm/page_table_check.c:105
Modules linked in:
irq event stamp: 4986957
hardirqs last  enabled at (4986956): [<ffffffff876b20b2>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
hardirqs last  enabled at (4986956): [<ffffffff876b20b2>] _raw_spin_unlock_irqrestore+0x52/0x80 kernel/locking/spinlock.c:194
hardirqs last disabled at (4986957): [<ffffffff876b1dc2>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline]
hardirqs last disabled at (4986957): [<ffffffff876b1dc2>] _raw_spin_lock_irqsave+0x52/0x60 kernel/locking/spinlock.c:162
softirqs last  enabled at (4986950): [<ffffffff8176f0bd>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (4986950): [<ffffffff8176f0bd>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (4986950): [<ffffffff8176f0bd>] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
softirqs last disabled at (4986953): [<ffffffff8176f0bd>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (4986953): [<ffffffff8176f0bd>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (4986953): [<ffffffff8176f0bd>] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723
Preemption disabled at:
[<0000000000000000>] 0x0
----------------
Code disassembly (best guess):
   0:	5a                   	pop    %rdx
   1:	00 be 03 00 00 00    	add    %bh,0x3(%rsi)
   7:	5b                   	pop    %rbx
   8:	e9 e2 26 1a 01       	jmp    0x11a26ef
   d:	66 90                	xchg   %ax,%ax
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	f3 0f 1e fa          	endbr64
  23:	65 8b 05 25 16 43 0b 	mov    %gs:0xb431625(%rip),%eax        # 0xb43164f
* 2a:	48 8b 34 24          	mov    (%rsp),%rsi <-- trapping instruction
  2e:	65 48 8b 15 01 16 43 	mov    %gs:0xb431601(%rip),%rdx        # 0xb431637
  35:	0b
  36:	a9 00 01 ff 00       	test   $0xff0100,%eax
  3b:	74 1b                	je     0x58
  3d:	f6 c4 01             	test   $0x1,%ah

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/07 05:39 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing bb375c251ab4 5cb44a80 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb WARNING: suspicious RCU usage in usb_tx_block
2026/03/04 22:41 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing bb375c251ab4 e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb WARNING: suspicious RCU usage in usb_tx_block
* Struck through repros no longer work on HEAD.