========================================================
WARNING: possible irq lock inversion dependency detected
5.7.0-rc1-next-20200415-syzkaller #0 Not tainted
--------------------------------------------------------
syz-executor.2/5944 just changed the state of lock:
ffffffff89a620f8 (shmlock_user_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:353 [inline]
ffffffff89a620f8 (shmlock_user_lock){+.+.}-{2:2}, at: user_shm_lock+0xab/0x230 mm/mlock.c:855
but this lock was taken by another, SOFTIRQ-safe lock in the past:
(&xa->xa_lock#4){..-.}-{2:2}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Chain exists of:
&xa->xa_lock#4 --> &info->lock --> shmlock_user_lock
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(shmlock_user_lock);
local_irq_disable();
lock(&xa->xa_lock#4);
lock(&info->lock);
<Interrupt>
lock(&xa->xa_lock#4);
*** DEADLOCK ***
1 lock held by syz-executor.2/5944:
#0: ffff8880666cb550 (&ids->rwsem){++++}-{3:3}, at: ipcget_new ipc/util.c:343 [inline]
#0: ffff8880666cb550 (&ids->rwsem){++++}-{3:3}, at: ipcget+0xc6/0xcb0 ipc/util.c:643
the shortest dependencies between 2nd lock and 1st lock:
-> (&xa->xa_lock#4){..-.}-{2:2} {
IN-SOFTIRQ-W at:
lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:159
test_clear_page_writeback+0x1d7/0x11e0 mm/page-writeback.c:2728
end_page_writeback+0x239/0x520 mm/filemap.c:1317
end_buffer_async_write+0x442/0x5c0 fs/buffer.c:384
end_bio_bh_io_sync+0xe2/0x140 fs/buffer.c:3049
bio_endio+0x46a/0x820 block/bio.c:1422
req_bio_endio block/blk-core.c:245 [inline]
blk_update_request+0x3e1/0xdc0 block/blk-core.c:1472
scsi_end_request+0x80/0x7b0 drivers/scsi/scsi_lib.c:575
scsi_io_completion+0x1e7/0x1300 drivers/scsi/scsi_lib.c:959
scsi_softirq_done+0x31e/0x3b0 drivers/scsi/scsi_lib.c:1454
blk_done_softirq+0x2db/0x440 block/blk-softirq.c:37
__do_softirq+0x26c/0x9f7 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x192/0x1d0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:546 [inline]
do_IRQ+0xda/0x270 arch/x86/kernel/irq.c:263
ret_from_intr+0x0/0x2b
arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
lock_acquire+0x267/0x8f0 kernel/locking/lockdep.c:4937
rcu_lock_acquire include/linux/rcupdate.h:208 [inline]
rcu_read_lock include/linux/rcupdate.h:601 [inline]
percpu_ref_tryget_live include/linux/percpu-refcount.h:276 [inline]
hd_struct_try_get block/blk.h:414 [inline]
blk_account_io_start+0x4f2/0xbd0 block/blk-core.c:1372
blk_mq_bio_to_request block/blk-mq.c:1784 [inline]
blk_mq_make_request+0x82d/0x20f0 block/blk-mq.c:2015
generic_make_request block/blk-core.c:1075 [inline]
generic_make_request+0x23c/0xb00 block/blk-core.c:1017
submit_bio+0x104/0x580 block/blk-core.c:1200
submit_bh_wbc+0x68a/0x8e0 fs/buffer.c:3100
__block_write_full_page+0x800/0x1280 fs/buffer.c:1838
block_write_full_page+0x21a/0x270 fs/buffer.c:3024
__writepage+0x62/0x100 mm/page-writeback.c:2303
write_cache_pages+0x799/0x12f0 mm/page-writeback.c:2238
generic_writepages mm/page-writeback.c:2329 [inline]
generic_writepages+0xed/0x160 mm/page-writeback.c:2318
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2344
__writeback_single_inode+0x12a/0x1410 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdd0 fs/fs-writeback.c:1716
__writeback_inodes_wb+0xc3/0x250 fs/fs-writeback.c:1785
wb_writeback+0x910/0xd90 fs/fs-writeback.c:1894
wb_check_background_flush fs/fs-writeback.c:1962 [inline]
wb_do_writeback fs/fs-writeback.c:2050 [inline]
wb_workfn+0xa49/0x11c0 fs/fs-writeback.c:2078
process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
worker_thread+0x96/0xe20 kernel/workqueue.c:2414
kthread+0x388/0x470 kernel/kthread.c:268
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
INITIAL USE at:
lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x5b/0x80 kernel/locking/spinlock.c:167
spin_lock_irq include/linux/spinlock.h:378 [inline]
__add_to_page_cache_locked+0x607/0xe00 mm/filemap.c:855
add_to_page_cache_lru+0x1aa/0x700 mm/filemap.c:921
do_read_cache_page+0x9ab/0x1810 mm/filemap.c:2761
read_mapping_page include/linux/pagemap.h:397 [inline]
read_part_sector+0xf6/0x600 block/partitions/core.c:643
adfspart_check_ICS+0x9d/0xc80 block/partitions/acorn.c:360
check_partition block/partitions/core.c:140 [inline]
blk_add_partitions+0x474/0xe50 block/partitions/core.c:571
bdev_disk_changed+0x1fb/0x380 fs/block_dev.c:1544
__blkdev_get+0xb15/0x1530 fs/block_dev.c:1647
blkdev_get+0x41/0x2b0 fs/block_dev.c:1749
register_disk block/genhd.c:763 [inline]
__device_add_disk+0xa4f/0x1170 block/genhd.c:853
add_disk include/linux/genhd.h:294 [inline]
brd_init+0x297/0x463 drivers/block/brd.c:533
do_one_initcall+0x10a/0x7d0 init/main.c:1160
do_initcall_level init/main.c:1233 [inline]
do_initcalls init/main.c:1249 [inline]
do_basic_setup init/main.c:1269 [inline]
kernel_init_freeable+0x501/0x5ae init/main.c:1454
kernel_init+0xd/0x1bb init/main.c:1360
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
}
... key at: [<ffffffff8c6b4140>] __key.18068+0x0/0x40
... acquired at:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x8c/0xbf kernel/locking/spinlock.c:159
shmem_uncharge+0x24/0x270 mm/shmem.c:341
__split_huge_page mm/huge_memory.c:2613 [inline]
split_huge_page_to_list+0x274b/0x33b0 mm/huge_memory.c:2886
split_huge_page include/linux/huge_mm.h:204 [inline]
shmem_punch_compound+0x13e/0x1e0 mm/shmem.c:814
shmem_undo_range+0x5f1/0x1b80 mm/shmem.c:870
shmem_truncate_range+0x27/0xa0 mm/shmem.c:980
shmem_setattr+0x8b6/0xc80 mm/shmem.c:1039
notify_change+0xb6d/0x1020 fs/attr.c:336
do_truncate+0x134/0x1f0 fs/open.c:64
vfs_truncate+0x559/0x6e0 fs/open.c:110
do_sys_truncate.part.0+0x11e/0x140 fs/open.c:133
do_sys_truncate fs/open.c:127 [inline]
__do_sys_truncate fs/open.c:145 [inline]
__se_sys_truncate fs/open.c:143 [inline]
__x64_sys_truncate+0x69/0x90 fs/open.c:143
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
-> (&info->lock){....}-{2:2} {
INITIAL USE at:
lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
_raw_spin_lock_irq+0x5b/0x80 kernel/locking/spinlock.c:167
spin_lock_irq include/linux/spinlock.h:378 [inline]
shmem_getpage_gfp+0x937/0x2a10 mm/shmem.c:1882
shmem_getpage mm/shmem.c:154 [inline]
shmem_write_begin+0x102/0x1e0 mm/shmem.c:2483
generic_perform_write+0x20a/0x4e0 mm/filemap.c:3308
__generic_file_write_iter+0x24c/0x610 mm/filemap.c:3437
generic_file_write_iter+0x3f3/0x630 mm/filemap.c:3469
call_write_iter include/linux/fs.h:1907 [inline]
new_sync_write+0x4a2/0x700 fs/read_write.c:484
__vfs_write+0xc9/0x100 fs/read_write.c:497
vfs_write+0x268/0x5d0 fs/read_write.c:559
ksys_write+0x12d/0x250 fs/read_write.c:612
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
}
... key at: [<ffffffff8c6a0bc0>] __key.56628+0x0/0x40
... acquired at:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:353 [inline]
user_shm_lock+0xab/0x230 mm/mlock.c:855
shmem_lock+0x1dd/0x2d0 mm/shmem.c:2184
shmctl_do_lock+0x73f/0x8f0 ipc/shm.c:1111
ksys_shmctl.constprop.0+0x203/0x350 ipc/shm.c:1188
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
-> (shmlock_user_lock){+.+.}-{2:2} {
HARDIRQ-ON-W at:
lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:353 [inline]
user_shm_lock+0xab/0x230 mm/mlock.c:855
hugetlb_file_setup+0x4e1/0x677 fs/hugetlbfs/inode.c:1416
newseg+0x460/0xe60 ipc/shm.c:652
ipcget_new ipc/util.c:344 [inline]
ipcget+0xf0/0xcb0 ipc/util.c:643
ksys_shmget ipc/shm.c:742 [inline]
__do_sys_shmget ipc/shm.c:747 [inline]
__se_sys_shmget ipc/shm.c:745 [inline]
__x64_sys_shmget+0x139/0x1a0 ipc/shm.c:745
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
SOFTIRQ-ON-W at:
lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:353 [inline]
user_shm_lock+0xab/0x230 mm/mlock.c:855
hugetlb_file_setup+0x4e1/0x677 fs/hugetlbfs/inode.c:1416
newseg+0x460/0xe60 ipc/shm.c:652
ipcget_new ipc/util.c:344 [inline]
ipcget+0xf0/0xcb0 ipc/util.c:643
ksys_shmget ipc/shm.c:742 [inline]
__do_sys_shmget ipc/shm.c:747 [inline]
__se_sys_shmget ipc/shm.c:745 [inline]
__x64_sys_shmget+0x139/0x1a0 ipc/shm.c:745
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
INITIAL USE at:
lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:353 [inline]
user_shm_lock+0xab/0x230 mm/mlock.c:855
shmem_lock+0x1dd/0x2d0 mm/shmem.c:2184
shmctl_do_lock+0x73f/0x8f0 ipc/shm.c:1111
ksys_shmctl.constprop.0+0x203/0x350 ipc/shm.c:1188
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
}
... key at: [<ffffffff89a620f8>] shmlock_user_lock+0x18/0x5c0
... acquired at:
mark_lock_irq kernel/locking/lockdep.c:3585 [inline]
mark_lock+0x624/0xf10 kernel/locking/lockdep.c:3935
mark_usage kernel/locking/lockdep.c:3852 [inline]
__lock_acquire+0x98c/0x4c50 kernel/locking/lockdep.c:4309
lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:353 [inline]
user_shm_lock+0xab/0x230 mm/mlock.c:855
hugetlb_file_setup+0x4e1/0x677 fs/hugetlbfs/inode.c:1416
newseg+0x460/0xe60 ipc/shm.c:652
ipcget_new ipc/util.c:344 [inline]
ipcget+0xf0/0xcb0 ipc/util.c:643
ksys_shmget ipc/shm.c:742 [inline]
__do_sys_shmget ipc/shm.c:747 [inline]
__se_sys_shmget ipc/shm.c:745 [inline]
__x64_sys_shmget+0x139/0x1a0 ipc/shm.c:745
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
stack backtrace:
CPU: 1 PID: 5944 Comm: syz-executor.2 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0
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+0x188/0x20d lib/dump_stack.c:118
print_irq_inversion_bug kernel/locking/lockdep.c:3448 [inline]
check_usage_backwards.cold+0x1d/0x26 kernel/locking/lockdep.c:3499
mark_lock_irq kernel/locking/lockdep.c:3585 [inline]
mark_lock+0x624/0xf10 kernel/locking/lockdep.c:3935
mark_usage kernel/locking/lockdep.c:3852 [inline]
__lock_acquire+0x98c/0x4c50 kernel/locking/lockdep.c:4309
lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:353 [inline]
user_shm_lock+0xab/0x230 mm/mlock.c:855
hugetlb_file_setup+0x4e1/0x677 fs/hugetlbfs/inode.c:1416
newseg+0x460/0xe60 ipc/shm.c:652
ipcget_new ipc/util.c:344 [inline]
ipcget+0xf0/0xcb0 ipc/util.c:643
ksys_shmget ipc/shm.c:742 [inline]
__do_sys_shmget ipc/shm.c:747 [inline]
__se_sys_shmget ipc/shm.c:745 [inline]
__x64_sys_shmget+0x139/0x1a0 ipc/shm.c:745
do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45c829
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f35a265ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000001d
RAX: ffffffffffffffda RBX: 0000000000506620 RCX: 000000000045c829
RDX: 0000000000001800 RSI: 0000000000003000 RDI: 0000000000000000
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020ffd000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000b69 R14: 00000000004cd9f9 R15: 00007f35a265f6d4
hugetlbfs: syz-executor.2 (5944): Using mlock ulimits for SHM_HUGETLB is deprecated