INFO: task syz.2.4368:20229 blocked for more than 430 seconds. Not tainted 6.16.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.4368 state:D stack:0 pid:20229 tgid:20228 ppid:16624 task_flags:0x400040 flags:0x00000005 Call trace: [<81a3a4bc>] (__schedule) from [<80297314>] (__schedule_loop kernel/sched/core.c:7043 [inline]) [<81a3a4bc>] (__schedule) from [<80297314>] (rt_mutex_schedule+0x20/0x38 kernel/sched/core.c:7339) r10:855fbc00 r9:00000002 r8:00000000 r7:df9e5d98 r6:df9e5da0 r5:838bd400 r4:838bd400 [<802972f4>] (rt_mutex_schedule) from [<81a4158c>] (rt_mutex_slowlock_block.constprop.0+0x40/0x1d4 kernel/locking/rtmutex.c:1647) r5:838bd400 r4:8325d854 [<81a4154c>] (rt_mutex_slowlock_block.constprop.0) from [<81a428e4>] (__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]) [<81a4154c>] (rt_mutex_slowlock_block.constprop.0) from [<81a428e4>] (__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]) [<81a4154c>] (rt_mutex_slowlock_block.constprop.0) from [<81a428e4>] (rt_mutex_slowlock.constprop.0+0xd4/0x364 kernel/locking/rtmutex.c:1800) r10:60000013 r9:df9e5da0 r8:00000002 r7:df9e5d98 r6:8325d854 r5:00000000 r4:838bd400 [<81a42810>] (rt_mutex_slowlock.constprop.0) from [<81a42c58>] (__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]) [<81a42810>] (rt_mutex_slowlock.constprop.0) from [<81a42c58>] (__rt_mutex_lock_common kernel/locking/rtmutex_api.c:49 [inline]) [<81a42810>] (rt_mutex_slowlock.constprop.0) from [<81a42c58>] (rt_mutex_lock+0x44/0x48 kernel/locking/rtmutex_api.c:89) r10:00000022 r9:000000da r8:00000000 r7:000000da r6:00000000 r5:00000001 r4:8325d840 [<81a42c14>] (rt_mutex_lock) from [<810ca608>] (i2c_adapter_lock_bus+0x14/0x18 drivers/i2c/i2c-core-base.c:852) [<810ca5f4>] (i2c_adapter_lock_bus) from [<810cfe18>] (i2c_lock_bus include/linux/i2c.h:809 [inline]) [<810ca5f4>] (i2c_adapter_lock_bus) from [<810cfe18>] (__i2c_lock_bus_helper drivers/i2c/i2c-core.h:46 [inline]) [<810ca5f4>] (i2c_adapter_lock_bus) from [<810cfe18>] (i2c_smbus_xfer+0xa4/0x12c drivers/i2c/i2c-core-smbus.c:542) [<810cfd74>] (i2c_smbus_xfer) from [<810d1c94>] (i2cdev_ioctl_smbus+0xf4/0x384 drivers/i2c/i2c-dev.c:389) r8:00000022 r7:20000040 r6:00000001 r5:86cb3800 r4:00000008 [<810d1ba0>] (i2cdev_ioctl_smbus) from [<810d222c>] (i2cdev_ioctl+0x308/0x404 drivers/i2c/i2c-dev.c:478) r10:838bd400 r9:00000004 r8:8594cb40 r7:200000c0 r6:b5403587 r5:86cb3800 r4:200000c0 [<810d1f24>] (i2cdev_ioctl) from [<8056ce1c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<810d1f24>] (i2cdev_ioctl) from [<8056ce1c>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<810d1f24>] (i2cdev_ioctl) from [<8056ce1c>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<810d1f24>] (i2cdev_ioctl) from [<8056ce1c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r6:8594cb41 r5:00000000 r4:00000720 [<8056ccec>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9e5fa8 to 0xdf9e5ff0) 5fa0: 00000000 00000000 00000004 00000720 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76be30bc 5fe0: 76be2ec0 76be2eb0 0001945c 00132260 r10:00000036 r9:838bd400 r8:8020029c r7:00000036 r6:002f6308 r5:00000000 r4:00000000 NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Not tainted 6.16.0-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express Call trace: [<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:00000000 r6:00000113 r5:60000193 r4:8225ff64 [<80201b08>] (show_stack) from [<8021fb90>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201b08>] (show_stack) from [<8021fb90>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120) [<8021fb20>] (dump_stack_lvl) from [<8021fbb4>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r5:00000001 r4:00000001 [<8021fb9c>] (dump_stack) from [<81a240d0>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113) [<81a23f70>] (nmi_cpu_backtrace) from [<81a2421c>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000001 r6:8280c690 r5:8281ac94 r4:ffffffff [<81a240ec>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:82abd564 r8:82804d40 r7:0002b341 r6:00007f0b r5:8281b248 r4:8383020c [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037da10>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037da10>] (check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037da10>] (watchdog+0x4d4/0x81c kernel/hung_task.c:491) [<8037d53c>] (watchdog) from [<80281fec>] (kthread+0x12c/0x280 kernel/kthread.c:463) r10:00000000 r9:00000000 r8:8037d53c r7:8334c700 r6:8334c700 r5:833d8000 r4:00000001 [<80281ec0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137) Exception stack(0xdf8e1fb0 to 0xdf8e1ff8) 1fa0: 00000000 00000000 00000000 00000000 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281ec0 r4:8334bb00 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2931 Comm: klogd Not tainted 6.16.0-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at vector_swi+0x6c/0x80 arch/arm/kernel/entry-common.S:232 LR is at vector_swi+0x5c/0x80 arch/arm/kernel/entry-common.S:193 pc : [<802001ec>] lr : [<802001dc>] psr: 600f0013 sp : ec285fb0 ip : ec285fb0 fp : 00000000 r10: 30c5387d r9 : 76d79590 r8 : b5403587 r7 : 00000121 r6 : 7edf7858 r5 : 00000000 r4 : 00000000 r3 : 00004000 r2 : 00000070 r1 : 7edf7858 r0 : 00000003 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 848715c0 DAC: fffffffd Call trace: no frame pointer