syzbot has found a reproducer for the following issue on: HEAD commit: 226ff2e681d0 usb: typec: ucsi: Convert connector specific .. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=132b5e30580000 kernel config: https://syzkaller.appspot.com/x/.config?x=358c1689354aeef3 dashboard link: https://syzkaller.appspot.com/bug?extid=592e2ab8775dbe0bf09a compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144614e8580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=172b5e30580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e48f2af8afd7/disk-226ff2e6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/76328e28b54c/vmlinux-226ff2e6.xz kernel image: https://storage.googleapis.com/syzbot-assets/ab9f75a466a2/bzImage-226ff2e6.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+592e2ab8775dbe0bf09a@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task udevd:5169 blocked for more than 143 seconds. Not tainted 6.12.0-rc6-syzkaller-00103-g226ff2e681d0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:27904 pid:5169 tgid:5169 ppid:2861 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x1042/0x34b0 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6782 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 device_lock include/linux/device.h:1014 [inline] uevent_show+0x188/0x3b0 drivers/base/core.c:2736 dev_attr_show+0x53/0xe0 drivers/base/core.c:2430 sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59 seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230 kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279 new_sync_read fs/read_write.c:488 [inline] vfs_read+0x87f/0xbe0 fs/read_write.c:569 ksys_read+0x12f/0x260 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9e4a253b6a RSP: 002b:00007ffc471c56a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000055b598d2b6f0 RCX: 00007f9e4a253b6a RDX: 0000000000001000 RSI: 000055b598e72930 RDI: 0000000000000008 RBP: 000055b598d2b6f0 R08: 0000000000000008 R09: 0000000000000000 R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000003fff R14: 00007ffc471c5b88 R15: 000000000000000a </TASK> INFO: task udevd:5198 blocked for more than 144 seconds. Not tainted 6.12.0-rc6-syzkaller-00103-g226ff2e681d0 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:27136 pid:5198 tgid:5198 ppid:2861 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5328 [inline] __schedule+0x1042/0x34b0 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6782 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 device_lock include/linux/device.h:1014 [inline] uevent_show+0x188/0x3b0 drivers/base/core.c:2736 dev_attr_show+0x53/0xe0 drivers/base/core.c:2430 sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59 seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230 kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279 new_sync_read fs/read_write.c:488 [inline] vfs_read+0x87f/0xbe0 fs/read_write.c:569 ksys_read+0x12f/0x260 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9e4a253b6a RSP: 002b:00007ffc471c56a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000055b598d2b6f0 RCX: 00007f9e4a253b6a RDX: 0000000000001000 RSI: 000055b598e72930 RDI: 0000000000000008 RBP: 000055b598d2b6f0 R08: 0000000000000008 R09: 0000000000008000 R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000003fff R14: 00007ffc471c5b88 R15: 000000000000000a </TASK> Showing all locks held in the system: 7 locks held by kworker/1:0/24: 1 lock held by khungtaskd/30: #0: ffffffff88ebb140 ( rcu_read_lock ){....}-{1:2} , at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] , at: rcu_read_lock include/linux/rcupdate.h:849 [inline] , at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720 5 locks held by kworker/1:2/1080: 2 locks held by getty/2919: #0: ffff888115b080a0 ( &tty->ldisc_sem ){++++}-{0:0} , at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000432f0 ( &ldata->atomic_read_lock ){+.+.}-{3:3} , at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 6 locks held by kworker/1:1/5068: 1 lock held by udevd/5168: 4 locks held by udevd/5169: #0: ffff888114560b08 ( &p->lock ){+.+.}-{3:3} , at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182 #1: ffff88811ea2c088 ( &of->mutex #2 ){+.+.}-{3:3} , at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154 #2: ffff8881133e90f8 ( kn->active #5 ){.+.+}-{0:0} , at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155 #3: ffff88811e7e9190 ( &dev->mutex ){....}-{3:3} , at: device_lock include/linux/device.h:1014 [inline] , at: uevent_show+0x188/0x3b0 drivers/base/core.c:2736 5 locks held by kworker/1:3/5180: 4 locks held by udevd/5187: 5 locks held by kworker/1:4/5188: 3 locks held by kworker/1:5/5193: 4 locks held by udevd/5198: #0: ffff888114560418 ( &p->lock ){+.+.}-{3:3} , at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182 #1: ffff88810e326488 ( &of->mutex #2 ){+.+.}-{3:3} , at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154 #2: ffff888113ce13c8 ( kn->active #5 ){.+.+}-{0:0} , at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155 #3: ffff888105eee190 ( &dev->mutex ){....}-{3:3} , at: device_lock include/linux/device.h:1014 [inline] , at: uevent_show+0x188/0x3b0 drivers/base/core.c:2736 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc6-syzkaller-00103-g226ff2e681d0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf0c/0x1240 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Sending NMI from CPU 0 to CPUs 1: imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5187 Comm: udevd Not tainted 6.12.0-rc6-syzkaller-00103-g226ff2e681d0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:413 Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1c 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 cc cc cc cc e8 11 e5 0d ff eb a0 e8 9a e5 0d RSP: 0000:ffffc900001b8500 EFLAGS: 00000002 RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: ffffffff82a096d5 RDI: ffffffff936396a0 RBP: ffffffff93639660 R08: 0000000000000001 R09: 000000000000001f R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 000000000000005b R14: ffffffff82a09670 R15: 0000000000000000 FS: 00007f9e4a128c80(0000) GS:ffff8881f5900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e49821038 CR3: 000000011f1f6000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> serial_out drivers/tty/serial/8250/8250.h:142 [inline] serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3322 [inline] serial8250_console_write+0xf9e/0x17c0 drivers/tty/serial/8250/8250_port.c:3393 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x800/0xc60 kernel/printk/printk.c:3180 __console_flush_and_unlock kernel/printk/printk.c:3239 [inline] console_unlock+0xd9/0x210 kernel/printk/printk.c:3279 vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2407 dev_vprintk_emit drivers/base/core.c:4942 [inline] dev_printk_emit+0xfb/0x140 drivers/base/core.c:4953 __dev_printk+0xf5/0x270 drivers/base/core.c:4965 _dev_warn+0xe5/0x120 drivers/base/core.c:5009 usb_rx_callback_intf0+0x11c/0x1a0 drivers/media/rc/imon.c:1768 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734 dummy_timer+0x17f0/0x3930 drivers/usb/gadget/udc/dummy_hcd.c:1993 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1755 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1772 handle_softirqs+0x206/0x8d0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xac/0x110 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:___slab_alloc+0x388/0x1760 mm/slub.c:3887 Code: 44 24 28 00 00 00 00 4c 89 e7 48 8d 35 00 00 00 00 e8 9c 9f 8c ff 80 e7 02 0f 85 f1 04 00 00 9c 58 f6 c4 02 0f 85 76 07 00 00 <48> 8b 45 c8 65 48 2b 04 25 28 00 00 00 0f 85 34 11 00 00 48 8d 65 RSP: 0000:ffffc90001e3fb50 EFLAGS: 00000246 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 1ffffffff1f5bc7f RDX: 0000000000000000 RSI: ffffffff8727f220 RDI: ffffffff8746ec80 RBP: ffffc90001e3fc30 R08: 0000000000000001 R09: fffffbfff1f565c1 R10: ffffffff8fab2e0f R11: 0000000000000000 R12: ffff8881f59420d0 R13: 0000000000000000 R14: 00000000000420d0 R15: ffff888108329240 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] kmem_cache_alloc_noprof+0x270/0x2b0 mm/slub.c:4141 ptlock_alloc+0x1f/0x70 mm/memory.c:6918 ptlock_init include/linux/mm.h:2958 [inline] pagetable_pte_ctor include/linux/mm.h:2985 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:73 [inline] pte_alloc_one+0x74/0x390 arch/x86/mm/pgtable.c:33 do_fault_around mm/memory.c:5249 [inline] do_read_fault mm/memory.c:5288 [inline] do_fault mm/memory.c:5431 [inline] do_pte_missing mm/memory.c:3965 [inline] handle_pte_fault mm/memory.c:5766 [inline] __handle_mm_fault+0x1d49/0x33b0 mm/memory.c:5909 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6077 do_user_addr_fault+0x613/0x12c0 arch/x86/mm/fault.c:1338 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x55b56813c77c Code: 48 8b 04 25 28 00 00 00 48 89 84 24 18 08 00 00 31 c0 48 c7 84 24 08 08 00 00 00 00 00 00 48 c7 84 24 10 08 00 00 00 00 00 00 <48> 03 6d 38 48 8b 45 00 48 85 c0 74 6c 49 03 84 24 a8 00 00 00 4d RSP: 002b:00007ffc471c85a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00007ffc471c8e98 RDI: 000055b598d587e0 RBP: 00007f9e49821000 R08: 0000000000000001 R09: 00007ffc471c87e8 R10: 0000000000000058 R11: 0000000000000000 R12: 000055b598d587e0 R13: 00007ffc471c8e98 R14: 000055b598d61170 R15: 00007ffc471c9309 </TASK> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
