
=============================
WARNING: suspicious RCU usage
4.17.0-rc2+ #18 Not tainted
-----------------------------
include/linux/rcupdate.h:304 Illegal context switch in RCU read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
5 locks held by syz-executor7/4550:
 #0:         (ptrval) (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline]
 #0:         (ptrval) (sb_writers#4){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
 #1:         (ptrval) (&type->i_mutex_dir_key/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline]
 #1:         (ptrval) (&type->i_mutex_dir_key/1){+.+.}, at: do_rmdir+0x37b/0x610 fs/namei.c:3899
 #2:         (ptrval) (&type->i_mutex_dir_key){++++}, at: inode_lock include/linux/fs.h:713 [inline]
 #2:         (ptrval) (&type->i_mutex_dir_key){++++}, at: vfs_rmdir+0xe0/0x470 fs/namei.c:3840
 #3:         (ptrval) (jbd2_handle){.+.+}, at: start_this_handle+0x581/0x1250 fs/jbd2/transaction.c:385
 #4:         (ptrval) (rcu_read_lock){....}, at: __list_add include/linux/list.h:64 [inline]
 #4:         (ptrval) (rcu_read_lock){....}, at: list_add include/linux/list.h:79 [inline]
 #4:         (ptrval) (rcu_read_lock){....}, at: jbd2_write_access_granted.part.8+0x0/0x420 fs/jbd2/transaction.c:2544

stack backtrace:
CPU: 1 PID: 4550 Comm: syz-executor7 Not tainted 4.17.0-rc2+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4592
 rcu_preempt_sleep_check include/linux/rcupdate.h:303 [inline]
 ___might_sleep+0x26d/0x320 kernel/sched/core.c:6153
 __might_sleep+0x95/0x190 kernel/sched/core.c:6141
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x2b9/0x760 mm/slab.c:3727
 kmalloc_array include/linux/slab.h:631 [inline]
 kcalloc include/linux/slab.h:642 [inline]
 numa_crng_init drivers/char/random.c:798 [inline]
 crng_reseed+0x427/0x920 drivers/char/random.c:923
 credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708
 add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254
 handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191
 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206
 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791
 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
 handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77
 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:lock_acquire+0x257/0x520 kernel/locking/lockdep.c:3923
RSP: 0018:ffff8801a23c7740 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd5
RAX: dffffc0000000000 RBX: 1ffff10034478eed RCX: 0000000000000000
RDX: 1ffffffff11a315d RSI: ffff8801a23bef78 RDI: 0000000000000286
RBP: ffff8801a23c7830 R08: 0000000000000008 R09: 0000000000000004
R10: ffff8801a23bf018 R11: ffff8801a23be740 R12: ffff8801a23be740
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:246 [inline]
 rcu_read_lock include/linux/rcupdate.h:632 [inline]
 jbd2_write_access_granted.part.8+0x9a/0x420 fs/jbd2/transaction.c:1039
 jbd2_write_access_granted fs/jbd2/transaction.c:1096 [inline]
 jbd2_journal_get_write_access+0x91/0xc0 fs/jbd2/transaction.c:1086
 __ext4_journal_get_write_access+0x5e/0xa0 fs/ext4/ext4_jbd2.c:169
 ext4_orphan_add+0x2cb/0xda0 fs/ext4/namei.c:2777
 ext4_rmdir+0x7f4/0xd20 fs/ext4/namei.c:2969
 vfs_rmdir+0x251/0x470 fs/namei.c:3851
 do_rmdir+0x523/0x610 fs/namei.c:3911
 __do_sys_rmdir fs/namei.c:3929 [inline]
 __se_sys_rmdir fs/namei.c:3927 [inline]
 __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4556e7
RSP: 002b:00007ffd5f33a8d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00000000004556e7
RDX: 0000000000000000 RSI: 00007ffd5f33c680 RDI: 00007ffd5f33c680
RBP: 00007ffd5f33c680 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000006 R11: 0000000000000206 R12: 0000000001018940
R13: 0000000000000000 R14: 00000000000001df R15: 000000000001ccf5
BUG: sleeping function called from invalid context at mm/slab.h:421
in_atomic(): 1, irqs_disabled(): 1, pid: 4550, name: syz-executor7
5 locks held by syz-executor7/4550:
 #0:         (ptrval) (sb_writers#4){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline]
 #0:         (ptrval) (sb_writers#4){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
 #1:         (ptrval) (&type->i_mutex_dir_key/1){+.+.}, at: inode_lock_nested include/linux/fs.h:748 [inline]
 #1:         (ptrval) (&type->i_mutex_dir_key/1){+.+.}, at: do_rmdir+0x37b/0x610 fs/namei.c:3899
 #2:         (ptrval) (&type->i_mutex_dir_key){++++}, at: inode_lock include/linux/fs.h:713 [inline]
 #2:         (ptrval) (&type->i_mutex_dir_key){++++}, at: vfs_rmdir+0xe0/0x470 fs/namei.c:3840
 #3:         (ptrval) (jbd2_handle){.+.+}, at: start_this_handle+0x581/0x1250 fs/jbd2/transaction.c:385
 #4:         (ptrval) (rcu_read_lock){....}, at: __list_add include/linux/list.h:64 [inline]
 #4:         (ptrval) (rcu_read_lock){....}, at: list_add include/linux/list.h:79 [inline]
 #4:         (ptrval) (rcu_read_lock){....}, at: jbd2_write_access_granted.part.8+0x0/0x420 fs/jbd2/transaction.c:2544
irq event stamp: 1006732
hardirqs last  enabled at (1006731): [<ffffffff81b5515f>] slab_alloc mm/slab.c:3385 [inline]
hardirqs last  enabled at (1006731): [<ffffffff81b5515f>] kmem_cache_alloc+0x26f/0x760 mm/slab.c:3552
hardirqs last disabled at (1006732): [<ffffffff87800905>] interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625
softirqs last  enabled at (1006512): [<ffffffff87a00778>] __do_softirq+0x778/0xaf5 kernel/softirq.c:311
softirqs last disabled at (1006493): [<ffffffff814750c1>] invoke_softirq kernel/softirq.c:365 [inline]
softirqs last disabled at (1006493): [<ffffffff814750c1>] irq_exit+0x1d1/0x200 kernel/softirq.c:405
CPU: 1 PID: 4550 Comm: syz-executor7 Not tainted 4.17.0-rc2+ #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 ___might_sleep.cold.87+0x11f/0x13a kernel/sched/core.c:6188
 __might_sleep+0x95/0x190 kernel/sched/core.c:6141
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 __do_kmalloc mm/slab.c:3716 [inline]
 __kmalloc+0x2b9/0x760 mm/slab.c:3727
 kmalloc_array include/linux/slab.h:631 [inline]
 kcalloc include/linux/slab.h:642 [inline]
 numa_crng_init drivers/char/random.c:798 [inline]
 crng_reseed+0x427/0x920 drivers/char/random.c:923
 credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708
 add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254
 handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191
 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206
 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791
 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
 handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77
 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:lock_acquire+0x257/0x520 kernel/locking/lockdep.c:3923
RSP: 0018:ffff8801a23c7740 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd5
RAX: dffffc0000000000 RBX: 1ffff10034478eed RCX: 0000000000000000
RDX: 1ffffffff11a315d RSI: ffff8801a23bef78 RDI: 0000000000000286
RBP: ffff8801a23c7830 R08: 0000000000000008 R09: 0000000000000004
R10: ffff8801a23bf018 R11: ffff8801a23be740 R12: ffff8801a23be740
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:246 [inline]
 rcu_read_lock include/linux/rcupdate.h:632 [inline]
 jbd2_write_access_granted.part.8+0x9a/0x420 fs/jbd2/transaction.c:1039
 jbd2_write_access_granted fs/jbd2/transaction.c:1096 [inline]
 jbd2_journal_get_write_access+0x91/0xc0 fs/jbd2/transaction.c:1086
 __ext4_journal_get_write_access+0x5e/0xa0 fs/ext4/ext4_jbd2.c:169
 ext4_orphan_add+0x2cb/0xda0 fs/ext4/namei.c:2777
 ext4_rmdir+0x7f4/0xd20 fs/ext4/namei.c:2969
 vfs_rmdir+0x251/0x470 fs/namei.c:3851
 do_rmdir+0x523/0x610 fs/namei.c:3911
 __do_sys_rmdir fs/namei.c:3929 [inline]
 __se_sys_rmdir fs/namei.c:3927 [inline]
 __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4556e7
RSP: 002b:00007ffd5f33a8d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00000000004556e7
RDX: 0000000000000000 RSI: 00007ffd5f33c680 RDI: 00007ffd5f33c680
RBP: 00007ffd5f33c680 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000006 R11: 0000000000000206 R12: 0000000001018940
R13: 0000000000000000 R14: 00000000000001df R15: 000000000001ccf5
random: crng init done
tmpfs: No value for mount option '­•eXý˜ø^xyCÖmqÙ¨‹ÿƒ×í'
tmpfs: No value for mount option '­•eXý˜ø^xyCÖmqÙ¨‹ÿƒ×í'
IPVS: ftp: loaded support on port[0] = 21
tmpfs: No value for mount option 'ëéL'
tmpfs: No value for mount option 'ëéL'
libceph: parse_ips bad ip '0,file'
libceph: parse_ips bad ip '0,file'