random: sshd: uninitialized urandom read (32 bytes read) random: crng init done syz-executor632 (2068) used greatest stack depth: 23784 bytes left BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:51 in_atomic(): 1, irqs_disabled(): 0, pid: 0, name: swapper/0 no locks held by swapper/0/0. Preemption disabled at:[ 36.849289] [] schedule_preempt_disabled+0x1d/0x20 kernel/sched/core.c:3587 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.141+ #1 ffff8801db607a20 ffffffff81b42e79 ffffffff828094ad 0000000000000000 0000000000000101 ffffffff83029180 ffffffff83029180 ffff8801db607a58 ffffffff813f9ecf ffffffff83029180 ffffffff82a4fa80 0000000000000033 Call Trace: [ 36.890926] [] __dump_stack lib/dump_stack.c:15 [inline] [ 36.890926] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] ___might_sleep.cold.31+0x18a/0x1fc kernel/sched/core.c:7988 [] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7945 [] down_write+0x21/0xa0 kernel/locking/rwsem.c:51 [] inode_lock include/linux/fs.h:766 [inline] [] __generic_file_fsync+0xc1/0x1a0 fs/libfs.c:978 [] ext4_sync_file+0x659/0x10a0 fs/ext4/fsync.c:116 [] vfs_fsync_range+0x10c/0x260 fs/sync.c:195 [] generic_write_sync include/linux/fs.h:2607 [inline] [] dio_complete+0x512/0x6c0 fs/direct-io.c:282 [] dio_bio_end_aio+0x11c/0x370 fs/direct-io.c:323 [] bio_endio+0x1a5/0x1f0 block/bio.c:1781 [] req_bio_endio block/blk-core.c:157 [inline] [] blk_update_request+0x248/0x9b0 block/blk-core.c:2628 [] scsi_end_request+0x9d/0x5c0 drivers/scsi/scsi_lib.c:606 [] scsi_io_completion+0x273/0x17a0 drivers/scsi/scsi_lib.c:829 [] scsi_finish_command+0x3ba/0x530 drivers/scsi/scsi.c:607 [] scsi_softirq_done+0x250/0x360 drivers/scsi/scsi_lib.c:1567 [] blk_done_softirq+0x27d/0x3e0 block/blk-softirq.c:35 [] __do_softirq+0x20e/0x964 kernel/softirq.c:288 [] invoke_softirq kernel/softirq.c:368 [inline] [] irq_exit+0x11c/0x150 kernel/softirq.c:409 [] exiting_irq arch/x86/include/asm/apic.h:669 [inline] [] do_IRQ+0x10d/0x1c0 arch/x86/kernel/irq.c:252 [] common_interrupt+0x9d/0x9d arch/x86/entry/entry_64.S:461 [ 37.098554] [] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:56 [] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline] [] default_idle+0x55/0x360 arch/x86/kernel/process.c:437 [] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428 [] default_idle_call+0x45/0x60 kernel/sched/idle.c:97 [] cpuidle_idle_call kernel/sched/idle.c:155 [inline] [] cpu_idle_loop kernel/sched/idle.c:248 [inline] [] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303 [] rest_init+0x183/0x189 init/main.c:409 [] start_kernel+0x5fb/0x62f init/main.c:664 [] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196 [] x86_64_start_kernel+0x13a/0x15d arch/x86/kernel/head64.c:177 ================================= [ INFO: inconsistent lock state ] 4.9.141+ #1 Tainted: G W --------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: (&sb->s_type->i_mutex_key#9){+.?.+.}, at: [] inode_lock include/linux/fs.h:766 [inline] (&sb->s_type->i_mutex_key#9){+.?.+.}, at: [] __generic_file_fsync+0xc1/0x1a0 fs/libfs.c:978 mark_irqflags kernel/locking/lockdep.c:2941 [inline] __lock_acquire+0xbdd/0x4a10 kernel/locking/lockdep.c:3302 lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756 down_write+0x41/0xa0 kernel/locking/rwsem.c:52 inode_lock include/linux/fs.h:766 [inline] bprm_fill_uid fs/exec.c:1506 [inline] prepare_binprm+0x2b7/0x750 fs/exec.c:1540 do_execveat_common.isra.14+0xe9f/0x1ed0 fs/exec.c:1766 do_execve fs/exec.c:1829 [inline] SYSC_execve fs/exec.c:1910 [inline] SyS_execve+0x42/0x50 fs/exec.c:1905 do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285 entry_SYSCALL_64_after_swapgs+0x5d/0xdb irq event stamp: 283986 hardirqs last enabled at (283986): [] restore_regs_and_iret+0x0/0x1d hardirqs last disabled at (283985): [] apic_timer_interrupt+0x98/0xb0 arch/x86/entry/entry_64.S:648 softirqs last enabled at (283948): [] _local_bh_enable+0x1c/0x50 kernel/softirq.c:159 softirqs last disabled at (283949): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (283949): [] irq_exit+0x11c/0x150 kernel/softirq.c:409 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sb->s_type->i_mutex_key#9); lock(&sb->s_type->i_mutex_key#9); *** DEADLOCK *** no locks held by swapper/0/0. stack backtrace: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.9.141+ #1 ffff8801db607790 ffffffff81b42e79 ffffffff83029180 ffffffff83cab370 ffffffff83029a30 ffffffff83029a50 ffffffff84244d40 ffff8801db607808 ffffffff81400780 0000000000000001 ffffffff00000001 0000000000000000 Call Trace: [ 37.376862] [] __dump_stack lib/dump_stack.c:15 [inline] [ 37.376862] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_usage_bug.cold.40+0x44e/0x57e kernel/locking/lockdep.c:2387 [] valid_state kernel/locking/lockdep.c:2400 [inline] [] mark_lock_irq kernel/locking/lockdep.c:2602 [inline] [] mark_lock+0x2f2/0x1290 kernel/locking/lockdep.c:3065 [] mark_irqflags kernel/locking/lockdep.c:2923 [inline] [] __lock_acquire+0x1084/0x4a10 kernel/locking/lockdep.c:3302 [] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756 [] down_write+0x41/0xa0 kernel/locking/rwsem.c:52 [] inode_lock include/linux/fs.h:766 [inline] [] __generic_file_fsync+0xc1/0x1a0 fs/libfs.c:978 [] ext4_sync_file+0x659/0x10a0 fs/ext4/fsync.c:116 [] vfs_fsync_range+0x10c/0x260 fs/sync.c:195 [] generic_write_sync include/linux/fs.h:2607 [inline] [] dio_complete+0x512/0x6c0 fs/direct-io.c:282 [] dio_bio_end_aio+0x11c/0x370 fs/direct-io.c:323 [] bio_endio+0x1a5/0x1f0 block/bio.c:1781 [] req_bio_endio block/blk-core.c:157 [inline] [] blk_update_request+0x248/0x9b0 block/blk-core.c:2628 [] scsi_end_request+0x9d/0x5c0 drivers/scsi/scsi_lib.c:606 [] scsi_io_completion+0x273/0x17a0 drivers/scsi/scsi_lib.c:829 [] scsi_finish_command+0x3ba/0x530 drivers/scsi/scsi.c:607 [] scsi_softirq_done+0x250/0x360 drivers/scsi/scsi_lib.c:1567 [] blk_done_softirq+0x27d/0x3e0 block/blk-softirq.c:35 [] __do_softirq+0x20e/0x964 kernel/softirq.c:288 [] invoke_softirq kernel/softirq.c:368 [inline] [] irq_exit+0x11c/0x150 kernel/softirq.c:409 [] exiting_irq arch/x86/include/asm/apic.h:669 [inline] [] do_IRQ+0x10d/0x1c0 arch/x86/kernel/irq.c:252 [] common_interrupt+0x9d/0x9d arch/x86/entry/entry_64.S:461 [ 37.657761] [] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:56 [] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline] [] default_idle+0x55/0x360 arch/x86/kernel/process.c:437 [] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:428 [] default_idle_call+0x45/0x60 kernel/sched/idle.c:97 [] cpuidle_idle_call kernel/sched/idle.c:155 [inline] [] cpu_idle_loop kernel/sched/idle.c:248 [inline] [] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303 [] rest_init+0x183/0x189 init/main.c:409 [] start_kernel+0x5fb/0x62f init/main.c:664 [] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196 [] x86_64_start_kernel+0x13a/0x15d arch/x86/kernel/head64.c:177 BUG: scheduling while atomic: swapper/0/0/0x00000102 INFO: lockdep is turned off. Modules linked in: Preemption disabled at:[ 37.754120] [] schedule_preempt_disabled+0x1d/0x20 kernel/sched/core.c:3587