INFO: task syz.5.378:1637 blocked for more than 122 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.5.378 state:D stack:0 pid:1637 tgid:1636 ppid:1446 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:6062 [inline] __schedule+0x1496/0x20b0 kernel/sched/core.c:7882 __schedule_loop kernel/sched/core.c:7959 [inline] schedule+0xc5/0x240 kernel/sched/core.c:7974 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8031 __mutex_lock_common kernel/locking/mutex.c:707 [inline] __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285 device_lock include/linux/device.h:911 [inline] usbdev_open+0x156/0x840 drivers/usb/core/devio.c:1051 chrdev_open+0x4e8/0x610 fs/char_dev.c:414 do_dentry_open+0x97f/0x1510 fs/open.c:954 vfs_open+0x86/0x240 fs/open.c:1086 do_open fs/namei.c:3782 [inline] path_openat+0x2c49/0x35a0 fs/namei.c:3941 do_filp_open+0x1f2/0x440 fs/namei.c:3968 do_sys_openat2+0x134/0x1d0 fs/open.c:1434 do_sys_open fs/open.c:1449 [inline] __do_sys_openat fs/open.c:1465 [inline] __se_sys_openat fs/open.c:1460 [inline] __x64_sys_openat+0x13a/0x170 fs/open.c:1460 x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f1f13d5e98e RSP: 002b:00007f1f14ce1b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f1f14ce26c0 RCX: 00007f1f13d5e98e RDX: 0000000000080001 RSI: 00007f1f14ce1c00 RDI: ffffffffffffff9c RBP: 00007f1f14ce1c00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd R13: 00007f1f14026038 R14: 00007f1f14025fa0 R15: 00007ffeaddc9818 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 28bb5670a1b4a83370a1b0f1e6655e31af14d592 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120 dump_stack+0x19/0x20 lib/dump_stack.c:129 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline] watchdog+0xe45/0xf90 kernel/hung_task.c:423 kthread+0x2c4/0x360 kernel/kthread.c:389 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 4404 Comm: syz.8.1170 Not tainted syzkaller #0 28bb5670a1b4a83370a1b0f1e6655e31af14d592 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:vm_normal_page+0xb3/0x220 mm/memory.c:663 Code: ee e8 51 d2 b7 ff 4d 39 ec 0f 87 a9 00 00 00 e8 e3 cf b7 ff 49 c1 e4 06 48 b8 00 00 00 00 00 ea ff ff 4c 01 e0 48 83 c4 08 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 b9 00 00 00 00 00 RSP: 0018:ffffc9000eef6fd0 EFLAGS: 00000282 RAX: ffffea0005078c80 RBX: 0000000000000002 RCX: ffff8881374cb900 RDX: 0000000000000000 RSI: 000000000023ffff RDI: 0000000000141e32 RBP: ffffc9000eef6ff0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52001ddede0 R12: 0000000005078c80 R13: 000000000023ffff R14: 8000000141e32025 R15: ffff88811a3668c0 FS: 00007f40a0b366c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd10e5b4ff8 CR3: 000000011b65c000 CR4: 00000000003526b0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: follow_page_pte+0x15b/0xba0 mm/gup.c:875 follow_pmd_mask mm/gup.c:-1 [inline] follow_pud_mask mm/gup.c:1041 [inline] follow_p4d_mask mm/gup.c:1058 [inline] follow_page_mask mm/gup.c:1101 [inline] __get_user_pages+0x87f/0x22d0 mm/gup.c:1506 __get_user_pages_locked mm/gup.c:1774 [inline] get_dump_page+0x10c/0x220 mm/gup.c:2292 dump_user_range+0x18b/0xe60 fs/coredump.c:997 elf_core_dump+0x2d61/0x3840 fs/binfmt_elf.c:2143 do_coredump+0x20d2/0x3050 fs/coredump.c:812 get_signal+0x11bf/0x1490 kernel/signal.c:2918 arch_do_signal_or_restart+0xbc/0x700 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x4d/0xb0 kernel/entry/common.c:231 irqentry_exit+0x16/0x60 kernel/entry/common.c:334 exc_page_fault+0x65/0xc0 arch/x86/mm/fault.c:1537 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f409fb9e161 Code: 00 00 00 00 0f 1f 44 00 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:00000000fffffeb0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f409fe25fa0 RCX: 00007f409fb9e159 RDX: 0000000000000000 RSI: 00000000fffffeb0 RDI: 0000000002000400 RBP: 00007f409fc35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f409fe26038 R14: 00007f409fe25fa0 R15: 00007fff9d42a188 bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) net_ratelimit: 26796 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:0a:31:d6:30:d4:1e, vlan:0)