INFO: task syz.1.8567:4279 blocked for more than 430 seconds. Not tainted 6.16.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.8567 state:D stack:0 pid:4279 tgid:4277 ppid:2931 task_flags:0x400140 flags:0x00000005 Call trace: [<81a27698>] (__schedule) from [<8029b4b0>] (__schedule_loop kernel/sched/core.c:6864 [inline]) [<81a27698>] (__schedule) from [<8029b4b0>] (rt_mutex_schedule+0x20/0x38 kernel/sched/core.c:7160) r10:83b6b000 r9:00000002 r8:00000000 r7:ec9eddb8 r6:ec9eddc0 r5:8495d400 r4:8495d400 [<8029b490>] (rt_mutex_schedule) from [<81a2da70>] (rt_mutex_slowlock_block.constprop.0+0x40/0x1d4 kernel/locking/rtmutex.c:1647) r5:8495d400 r4:83221c54 [<81a2da30>] (rt_mutex_slowlock_block.constprop.0) from [<81a2eda8>] (__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]) [<81a2da30>] (rt_mutex_slowlock_block.constprop.0) from [<81a2eda8>] (__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]) [<81a2da30>] (rt_mutex_slowlock_block.constprop.0) from [<81a2eda8>] (rt_mutex_slowlock.constprop.0+0xd4/0x364 kernel/locking/rtmutex.c:1800) r10:60000013 r9:ec9eddc0 r8:00000002 r7:ec9eddb8 r6:83221c54 r5:00000000 r4:8495d400 [<81a2ecd4>] (rt_mutex_slowlock.constprop.0) from [<81a2f11c>] (__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]) [<81a2ecd4>] (rt_mutex_slowlock.constprop.0) from [<81a2f11c>] (__rt_mutex_lock_common kernel/locking/rtmutex_api.c:31 [inline]) [<81a2ecd4>] (rt_mutex_slowlock.constprop.0) from [<81a2f11c>] (rt_mutex_lock+0x44/0x48 kernel/locking/rtmutex_api.c:71) r10:00000001 r9:810bc5ac r8:86e3a000 r7:00000000 r6:ec9ede80 r5:00000001 r4:83221c40 [<81a2f0d8>] (rt_mutex_lock) from [<810b5460>] (i2c_adapter_lock_bus+0x14/0x18 drivers/i2c/i2c-core-base.c:852) [<810b544c>] (i2c_adapter_lock_bus) from [<810b7238>] (i2c_lock_bus include/linux/i2c.h:809 [inline]) [<810b544c>] (i2c_adapter_lock_bus) from [<810b7238>] (__i2c_lock_bus_helper drivers/i2c/i2c-core.h:46 [inline]) [<810b544c>] (i2c_adapter_lock_bus) from [<810b7238>] (i2c_transfer+0x9c/0x110 drivers/i2c/i2c-core-base.c:2310) [<810b719c>] (i2c_transfer) from [<810b7308>] (i2c_transfer_buffer_flags+0x5c/0x8c drivers/i2c/i2c-core-base.c:2342) r6:00000000 r5:86e3a000 r4:00000700 [<810b72ac>] (i2c_transfer_buffer_flags) from [<810bc614>] (i2c_master_recv include/linux/i2c.h:79 [inline]) [<810b72ac>] (i2c_transfer_buffer_flags) from [<810bc614>] (i2cdev_read+0x68/0x140 drivers/i2c/i2c-dev.c:155) r7:8703b000 r6:87020a80 r5:00000000 r4:00000700 [<810bc5ac>] (i2cdev_read) from [<8054dc68>] (vfs_read+0x98/0x320 fs/read_write.c:570) r9:810bc5ac r8:00000000 r7:ec9edf68 r6:8495d400 r5:00000700 r4:87020a80 [<8054dbd0>] (vfs_read) from [<8054e910>] (ksys_read+0x74/0xe8 fs/read_write.c:715) r10:00000003 r9:8495d400 r8:8020029c r7:00000000 r6:00000000 r5:87020a80 r4:87020a81 [<8054e89c>] (ksys_read) from [<8054e994>] (__do_sys_read fs/read_write.c:724 [inline]) [<8054e89c>] (ksys_read) from [<8054e994>] (sys_read+0x10/0x14 fs/read_write.c:722) r7:00000003 r6:002f6300 r5:00000000 r4:00000000 [<8054e984>] (sys_read) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xec9edfa8 to 0xec9edff0) dfa0: 00000000 00000000 0000000a 00000000 00000700 00000000 dfc0: 00000000 00000000 002f6300 00000003 002e0000 00000000 00006364 76bab0bc dfe0: 76baaec0 76baaeb0 000193a4 00131fc0 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express Call trace: [<80201a00>] (dump_backtrace) from [<80201afc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:00000000 r6:00000013 r5:60000093 r4:8225b4e0 [<80201ae4>] (show_stack) from [<8021fe10>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201ae4>] (show_stack) from [<8021fe10>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120) [<8021fda0>] (dump_stack_lvl) from [<8021fe34>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r5:00000000 r4:00000001 [<8021fe1c>] (dump_stack) from [<81a115b8>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113) [<81a11458>] (nmi_cpu_backtrace) from [<81a11704>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62) r7:00000000 r6:8280c690 r5:8281af40 r4:ffffffff [<81a115d4>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852) r9:8280c80c r8:82ab3564 r7:8281bb28 r6:00007f11 r5:8281b508 r4:85ef0b0c [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fdc0>] (trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fdc0>] (check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]) [<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037fdc0>] (watchdog+0x4a8/0x74c kernel/hung_task.c:470) [<8037f918>] (watchdog) from [<80285f1c>] (kthread+0x12c/0x280 kernel/kthread.c:464) r10:00000000 r9:00000000 r8:8037f918 r7:83349780 r6:83349780 r5:83259800 r4:00000001 [<80285df0>] (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 r5:80285df0 r4:8334c580 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2915 Comm: klogd Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at desc_read_finalized_seq+0x48/0xcc kernel/printk/printk_ringbuffer.c:1881 LR is at 0xa6130 pc : [<802e8f20>] lr : [<000a6130>] psr: 60090013 sp : ec1ddd68 ip : 80003e32 fp : ec1ddda4 r10: 00000000 r9 : 00000000 r8 : 00000000 r7 : ec1dde20 r6 : ec1ddde0 r5 : 00005e32 r4 : 00000000 r3 : 00003e32 r2 : ec1ddde0 r1 : 00000000 r0 : 00000002 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 855bdac0 DAC: 00000000 Call trace: [<802e8ed8>] (desc_read_finalized_seq) from [<802e9568>] (prb_read kernel/printk/printk_ringbuffer.c:1922 [inline]) [<802e8ed8>] (desc_read_finalized_seq) from [<802e9568>] (_prb_read_valid+0xa8/0x31c kernel/printk/printk_ringbuffer.c:2113) r9:0000006a r8:82828548 r6:00005e32 r5:00001e32 r4:82828500 [<802e94c0>] (_prb_read_valid) from [<802ea364>] (prb_read_valid+0x24/0x2c kernel/printk/printk_ringbuffer.c:2185) r10:82a70268 r9:0000006a r8:00000000 r7:0000020c r6:76f29333 r5:82a704c8 r4:000001f3 [<802ea340>] (prb_read_valid) from [<802e36bc>] (syslog_print+0x298/0x3d0 kernel/printk/printk.c:1650) [<802e3424>] (syslog_print) from [<802e3dd8>] (do_syslog+0x16c/0x3a0 kernel/printk/printk.c:1785) r10:00000067 r9:8408c800 r8:76f29140 r7:000003ff r6:00000000 r5:00000000 r4:00000002 [<802e3c6c>] (do_syslog) from [<802e4020>] (__do_sys_syslog kernel/printk/printk.c:1877 [inline]) [<802e3c6c>] (do_syslog) from [<802e4020>] (sys_syslog+0x14/0x18 kernel/printk/printk.c:1875) r9:8408c800 r8:8020029c r7:00000067 r6:00000000 r5:76f2951a r4:76f29140 [<802e400c>] (sys_syslog) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xec1ddfa8 to 0xec1ddff0) dfa0: 76f29140 76f2951a 00000002 76f29140 000003ff 76f29140 dfc0: 76f29140 76f2951a 00000000 00000067 00000000 76f28904 76f29554 76f083bc dfe0: 76f28cdc 7edabc94 76eac2c8 76dce3ec