BUG: sleeping function called from invalid context at mm/slab.h:421 in_atomic(): 1, irqs_disabled(): 0, pid: 18, name: ksoftirqd/1 INFO: lockdep is turned off. Preemption disabled at: [] __do_softirq+0x189/0xad8 kernel/softirq.c:269 CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.19.0-rc6+ #48 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 ___might_sleep.cold.82+0x1ba/0x1f3 kernel/sched/core.c:6143 __might_sleep+0x95/0x190 kernel/sched/core.c:6096 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3378 [inline] kmem_cache_alloc_trace+0x2cd/0x750 mm/slab.c:3618 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] kobject_uevent_env+0x2f3/0x101e lib/kobject_uevent.c:514 kobject_uevent+0x1f/0x24 lib/kobject_uevent.c:636 kobject_cleanup lib/kobject.c:649 [inline] kobject_release lib/kobject.c:691 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold.9+0x170/0x2e4 lib/kobject.c:708 put_device+0x20/0x30 drivers/base/core.c:2024 delete_partition_rcu_cb+0x147/0x1b0 block/partition-generic.c:259 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2576 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2847 [inline] rcu_process_callbacks+0xf23/0x2670 kernel/rcu/tree.c:2864 __do_softirq+0x30b/0xad8 kernel/softirq.c:292 run_ksoftirqd+0x94/0x100 kernel/softirq.c:653 smpboot_thread_fn+0x68b/0xa00 kernel/smpboot.c:164 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413 audit: type=1804 audit(1538798348.989:159): pid=14943 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor0" name="/root/syzkaller-testdir223787280/syzkaller.DaRrIn/789/bus" dev="sda1" ino=16613 res=1 audit: type=1800 audit(1538798349.029:160): pid=14943 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=collect_data cause=failed(directio) comm="syz-executor0" name="bus" dev="sda1" ino=16613 res=0 audit: type=1804 audit(1538798349.289:161): pid=14953 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=ToMToU comm="syz-executor0" name="/root/syzkaller-testdir223787280/syzkaller.DaRrIn/789/bus" dev="sda1" ino=16613 res=1 audit: type=1804 audit(1538798349.289:162): pid=14938 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor0" name="/root/syzkaller-testdir223787280/syzkaller.DaRrIn/789/bus" dev="sda1" ino=16613 res=1 audit: type=1800 audit(1538798349.299:163): pid=14938 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=collect_data cause=failed(directio) comm="syz-executor0" name="bus" dev="sda1" ino=16613 res=0