INFO: task syz-executor.0:21059 blocked for more than 430 seconds. Not tainted 6.0.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack: 0 pid:21059 ppid: 17636 flags:0x00000001 Backtrace: [<8174a728>] (__schedule) from [<8174b220>] (schedule+0x5c/0xac kernel/sched/core.c:6571) r10:83112340 r9:00000000 r8:00000002 r7:00000000 r6:ee995df8 r5:83e65e00 r4:83e65e00 [<8174b1c4>] (schedule) from [<8174fc78>] (rt_mutex_slowlock_block.constprop.0+0x38/0x164 kernel/locking/rtmutex.c:1520) r5:83e65e00 r4:82adac54 [<8174fc40>] (rt_mutex_slowlock_block.constprop.0) from [<81750e40>] (__rt_mutex_slowlock.constprop.0+0x78/0x23c kernel/locking/rtmutex.c:1588) r10:00000004 r9:83e65e00 r8:ee995df8 r7:00000002 r6:82adac54 r5:00000000 r4:83e65e00 r3:ee995df8 [<81750dc8>] (__rt_mutex_slowlock.constprop.0) from [<817510b0>] (__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1624 [inline]) [<81750dc8>] (__rt_mutex_slowlock.constprop.0) from [<817510b0>] (rt_mutex_slowlock kernel/locking/rtmutex.c:1653 [inline]) [<81750dc8>] (__rt_mutex_slowlock.constprop.0) from [<817510b0>] (__rt_mutex_lock kernel/locking/rtmutex.c:1665 [inline]) [<81750dc8>] (__rt_mutex_slowlock.constprop.0) from [<817510b0>] (__rt_mutex_lock_common kernel/locking/rtmutex_api.c:31 [inline]) [<81750dc8>] (__rt_mutex_slowlock.constprop.0) from [<817510b0>] (rt_mutex_lock+0xac/0xc4 kernel/locking/rtmutex_api.c:71) r9:83e65e00 r8:00000000 r7:84ce2000 r6:a0000013 r5:82adac54 r4:00000000 [<81751004>] (rt_mutex_lock) from [<80ec724c>] (i2c_adapter_lock_bus+0x14/0x18 drivers/i2c/i2c-core-base.c:822) r6:ee995e90 r5:00000001 r4:82adac40 [<80ec7238>] (i2c_adapter_lock_bus) from [<80ec8f28>] (i2c_lock_bus include/linux/i2c.h:792 [inline]) [<80ec7238>] (i2c_adapter_lock_bus) from [<80ec8f28>] (__i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline]) [<80ec7238>] (i2c_adapter_lock_bus) from [<80ec8f28>] (i2c_transfer+0x94/0x134 drivers/i2c/i2c-core-base.c:2162) [<80ec8e94>] (i2c_transfer) from [<80ec9020>] (i2c_transfer_buffer_flags+0x58/0x8c drivers/i2c/i2c-core-base.c:2194) r6:84e1b840 r5:00000010 r4:00000000 [<80ec8fc8>] (i2c_transfer_buffer_flags) from [<80ecdcc8>] (i2c_master_send include/linux/i2c.h:110 [inline]) [<80ec8fc8>] (i2c_transfer_buffer_flags) from [<80ecdcc8>] (i2cdev_write+0x50/0x90 drivers/i2c/i2c-dev.c:175) r4:00000000 [<80ecdc78>] (i2cdev_write) from [<804a6bf4>] (vfs_write+0xb0/0x3bc fs/read_write.c:582) r7:ee995f68 r6:00000000 r5:84e1b840 r4:80ecdc78 [<804a6b44>] (vfs_write) from [<804a7068>] (ksys_write+0x68/0xec fs/read_write.c:637) r10:00000004 r9:83e65e00 r8:80200288 r7:00000000 r6:00000000 r5:84e1b840 r4:84e1b841 [<804a7000>] (ksys_write) from [<804a70fc>] (__do_sys_write fs/read_write.c:649 [inline]) [<804a7000>] (ksys_write) from [<804a70fc>] (sys_write+0x10/0x14 fs/read_write.c:646) r7:00000004 r6:0014bfe8 r5:00000000 r4:00000000 [<804a70ec>] (sys_write) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0xee995fa8 to 0xee995ff0) 5fa0: 00000000 00000000 00000004 00000000 00000000 00000000 5fc0: 00000000 00000000 0014bfe8 00000004 7ec233b2 76f526d0 7ec23544 76f5220c 5fe0: 76f52020 76f52010 000163f0 0004d570 NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.0.0-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<8172c094>] (dump_backtrace) from [<8172c188>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:253) r7:00000000 r6:000d0013 r5:600d0093 r4:81d97008 [<8172c170>] (show_stack) from [<81735128>] (__dump_stack lib/dump_stack.c:88 [inline]) [<8172c170>] (show_stack) from [<81735128>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106) [<817350e0>] (dump_stack_lvl) from [<8173514c>] (dump_stack+0x18/0x1c lib/dump_stack.c:113) r5:00000001 r4:00000001 [<81735134>] (dump_stack) from [<80830204>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:111) [<808300a4>] (nmi_cpu_backtrace) from [<80830354>] (nmi_trigger_cpumask_backtrace+0x134/0x1d4 lib/nmi_backtrace.c:62) r7:8240c494 r6:00000000 r5:8240ccdc r4:00000001 [<80830220>] (nmi_trigger_cpumask_backtrace) from [<802110fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:855) r9:000944c0 r8:82404d40 r7:00007f38 r6:8268f9a4 r5:8240c5fc r4:8328d13c [<802110e4>] (arch_trigger_cpumask_backtrace) from [<8032ff58>] (trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]) [<802110e4>] (arch_trigger_cpumask_backtrace) from [<8032ff58>] (check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]) [<802110e4>] (arch_trigger_cpumask_backtrace) from [<8032ff58>] (watchdog+0x4a8/0x598 kernel/hung_task.c:369) [<8032fab0>] (watchdog) from [<80269c14>] (kthread+0xec/0x11c kernel/kthread.c:376) r10:00000000 r9:df819e4c r8:82a98e00 r7:00000000 r6:8032fab0 r5:828f5240 r4:82b60b00 [<80269b28>] (kthread) from [<80200100>] (ret_from_fork+0x14/0x34 arch/arm/kernel/entry-common.S:148) Exception stack(0xdf8cdfb0 to 0xdf8cdff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80269b28 r4:82b60b00 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 21051 Comm: syz-executor.1 Not tainted 6.0.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at scllo drivers/i2c/algos/i2c-algo-bit.c:68 [inline] PC is at i2c_outb+0x7c/0x110 drivers/i2c/algos/i2c-algo-bit.c:176 LR is at i2c_versatile_setscl+0x1c/0x34 drivers/i2c/busses/i2c-versatile.c:40 pc : [<80ecfcd4>] lr : [<80ed2d48>] psr: 60000013 sp : ee9b9d80 ip : ee9b9d68 fp : ee9b9d9c r10: 00080bc2 r9 : 81f65320 r8 : 000000fc r7 : 000000fc r6 : 81f65320 r5 : 00000002 r4 : 82adaee0 r3 : df901004 r2 : 00000001 r1 : 00000000 r0 : 82adac40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 842fb0c0 DAC: fffffffd Backtrace: [<80ecfc58>] (i2c_outb) from [<80ecfdc8>] (try_address+0x60/0x88 drivers/i2c/algos/i2c-algo-bit.c:341) r7:82adac40 r6:7fffffff r5:82adaee0 r4:00000000 [<80ecfd68>] (try_address) from [<80ecff18>] (bit_doAddress drivers/i2c/algos/i2c-algo-bit.c:523 [inline]) [<80ecfd68>] (try_address) from [<80ecff18>] (bit_xfer+0x128/0x564 drivers/i2c/algos/i2c-algo-bit.c:563) r10:82adac40 r9:82404d40 r8:7fffffff r7:82adaee0 r6:81f65320 r5:00000000 r4:00000000 r3:0000b2fe [<80ecfdf0>] (bit_xfer) from [<80ec87b4>] (__i2c_transfer drivers/i2c/i2c-core-base.c:2105 [inline]) [<80ecfdf0>] (bit_xfer) from [<80ec87b4>] (__i2c_transfer+0x178/0x858 drivers/i2c/i2c-core-base.c:2070) r10:8240c440 r9:82404d40 r8:00000000 r7:84851380 r6:00000001 r5:00085b79 r4:82adac40 [<80ec863c>] (__i2c_transfer) from [<80ec8f38>] (i2c_transfer+0xa4/0x134 drivers/i2c/i2c-core-base.c:2166) r10:84d05880 r9:84851380 r8:84d05880 r7:00000001 r6:84851380 r5:00000001 r4:82adac40 [<80ec8e94>] (i2c_transfer) from [<80ece088>] (i2cdev_ioctl_rdwr+0x1f8/0x234 drivers/i2c/i2c-dev.c:297) r6:00000000 r5:00000000 r4:8485138c [<80ecde90>] (i2cdev_ioctl_rdwr) from [<80ecea90>] (i2cdev_ioctl+0x2d4/0x34c drivers/i2c/i2c-dev.c:458) r10:838ab650 r9:00000004 r8:84e1b300 r7:20000280 r6:84ce1400 r5:00000707 r4:20000280 [<80ece7bc>] (i2cdev_ioctl) from [<804be01c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<80ece7bc>] (i2cdev_ioctl) from [<804be01c>] (do_vfs_ioctl fs/ioctl.c:830 [inline]) [<80ece7bc>] (i2cdev_ioctl) from [<804be01c>] (__do_sys_ioctl fs/ioctl.c:868 [inline]) [<80ece7bc>] (i2cdev_ioctl) from [<804be01c>] (sys_ioctl+0x110/0xa74 fs/ioctl.c:856) r6:84e1b301 r5:00000000 r4:00000707 [<804bdf0c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:64) Exception stack(0xee9b9fa8 to 0xee9b9ff0) 9fa0: 00000000 00000000 00000004 00000707 20000280 00000000 9fc0: 00000000 00000000 0014bfe8 00000036 7eeb63b2 76f166d0 7eeb6544 76f1620c 9fe0: 76f16020 76f16010 000163f0 0004d570 r10:00000036 r9:83112340 r8:80200288 r7:00000036 r6:0014bfe8 r5:00000000 r4:00000000