On Sun, Apr 12, 2020 at 3:11 AM syzbot <syzbot+c8a8197c8852f566b9d9@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: ae46d2aa mm/gup: Let __get_user_pages_locked() return -EIN.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14a30a77e00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ca75979eeebf06c2 > dashboard link: https://syzkaller.appspot.com/bug?extid=c8a8197c8852f566b9d9 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f5632be00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132ade57e00000 > > The bug was bisected to: > > commit 71725ed10c40696dc6bdccf8e225815dcef24dba > Author: Hugh Dickins <hughd@xxxxxxxxxx> > Date: Tue Apr 7 03:07:57 2020 +0000 > > mm: huge tmpfs: try to split_huge_page() when punching hole > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=120a752be00000 > final crash: https://syzkaller.appspot.com/x/report.txt?x=110a752be00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=160a752be00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+c8a8197c8852f566b9d9@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: 71725ed10c40 ("mm: huge tmpfs: try to split_huge_page() when punching hole") > > ===================================================== > WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected > 5.6.0-syzkaller #0 Not tainted > ----------------------------------------------------- > syz-executor428/8337 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: > ffff8880a851c778 (&info->lock){....}-{2:2}, at: shmem_uncharge+0x24/0x270 mm/shmem.c:341 > > and this task is already holding: > ffff8880a851cac8 (&xa->xa_lock#4){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:353 [inline] > ffff8880a851cac8 (&xa->xa_lock#4){..-.}-{2:2}, at: split_huge_page_to_list+0xad0/0x33b0 mm/huge_memory.c:2864 > which would create a new lock dependency: > (&xa->xa_lock#4){..-.}-{2:2} -> (&info->lock){....}-{2:2} > > but this new dependency connects a SOFTIRQ-irq-safe lock: > (&xa->xa_lock#4){..-.}-{2:2} It looks shmem_uncharge() is just called by __split_huge_page() and collapse_file(). The collapse_file() has acquired xa_lock with irq disabled before acquiring info->lock, so it is safe. __split_huge_page() is called with holding xa_lock with irq enabled, but lru_lock is acquired with irq disabled before acquiring xa_lock. So, it is unnecessary to acquire info->lock with irq disabled in shmem_uncharge(). Can syzbot try the below patch? diff --git a/mm/shmem.c b/mm/shmem.c index d722eb8..100117b 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -334,15 +334,14 @@ bool shmem_charge(struct inode *inode, long pages) void shmem_uncharge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); - unsigned long flags; /* nrpages adjustment done by __delete_from_page_cache() or caller */ - spin_lock_irqsave(&info->lock, flags); + spin_lock(&info->lock); info->alloced -= pages; inode->i_blocks -= pages * BLOCKS_PER_PAGE; shmem_recalc_inode(inode); - spin_unlock_irqrestore(&info->lock, flags); + spin_unlock(&info->lock); shmem_inode_unacct_blocks(inode, pages); } > > ... which became SOFTIRQ-irq-safe at: > lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 > __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:3012 > bio_endio+0x473/0x820 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:4926 > down_write+0x8d/0x150 kernel/locking/rwsem.c:1531 > inode_lock include/linux/fs.h:797 [inline] > process_measurement+0x68a/0x1750 security/integrity/ima/ima_main.c:228 > ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:440 > do_open fs/namei.c:3231 [inline] > path_openat+0x1997/0x27d0 fs/namei.c:3346 > do_filp_open+0x192/0x260 fs/namei.c:3373 > do_sys_openat2+0x585/0x7d0 fs/open.c:1148 > do_sys_open+0xc3/0x140 fs/open.c:1164 > do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 > entry_SYSCALL_64_after_hwframe+0x49/0xb3 > > to a SOFTIRQ-irq-unsafe lock: > (shmlock_user_lock){+.+.}-{2:2} > > ... which became SOFTIRQ-irq-unsafe at: > ... > lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 > __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 > > 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 *** > > 5 locks held by syz-executor428/8337: > #0: ffff8880a7948450 (sb_writers#7){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1655 [inline] > #0: ffff8880a7948450 (sb_writers#7){.+.+}-{0:0}, at: do_sys_ftruncate+0x29f/0x570 fs/open.c:190 > #1: ffff8880a851c9d0 (&sb->s_type->i_mutex_key#16){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:797 [inline] > #1: ffff8880a851c9d0 (&sb->s_type->i_mutex_key#16){+.+.}-{3:3}, at: do_truncate+0x125/0x1f0 fs/open.c:62 > #2: ffff8880a851cb90 (&mapping->i_mmap_rwsem){++++}-{3:3}, at: i_mmap_lock_read include/linux/fs.h:541 [inline] > #2: ffff8880a851cb90 (&mapping->i_mmap_rwsem){++++}-{3:3}, at: split_huge_page_to_list+0x4c3/0x33b0 mm/huge_memory.c:2825 > #3: ffff88812ffffcd8 (&pgdat->lru_lock){....}-{2:2}, at: split_huge_page_to_list+0x8da/0x33b0 mm/huge_memory.c:2855 > #4: ffff8880a851cac8 (&xa->xa_lock#4){..-.}-{2:2}, at: spin_lock include/linux/spinlock.h:353 [inline] > #4: ffff8880a851cac8 (&xa->xa_lock#4){..-.}-{2:2}, at: split_huge_page_to_list+0xad0/0x33b0 mm/huge_memory.c:2864 > > the dependencies between SOFTIRQ-irq-safe lock and the holding lock: > -> (&xa->xa_lock#4){..-.}-{2:2} { > IN-SOFTIRQ-W at: > lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 > __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:3012 > bio_endio+0x473/0x820 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:4926 > down_write+0x8d/0x150 kernel/locking/rwsem.c:1531 > inode_lock include/linux/fs.h:797 [inline] > process_measurement+0x68a/0x1750 security/integrity/ima/ima_main.c:228 > ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:440 > do_open fs/namei.c:3231 [inline] > path_openat+0x1997/0x27d0 fs/namei.c:3346 > do_filp_open+0x192/0x260 fs/namei.c:3373 > do_sys_openat2+0x585/0x7d0 fs/open.c:1148 > do_sys_open+0xc3/0x140 fs/open.c:1164 > 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:4923 > __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:2755 > 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:1158 > do_initcall_level init/main.c:1231 [inline] > do_initcalls init/main.c:1247 [inline] > do_basic_setup init/main.c:1267 [inline] > kernel_init_freeable+0x501/0x5ae init/main.c:1451 > kernel_init+0xd/0x1bb init/main.c:1358 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > } > ... key at: [<ffffffff8c67b1e0>] __key.18007+0x0/0x40 > ... acquired at: > lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 > __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 > do_sys_ftruncate+0x4a5/0x570 fs/open.c:195 > do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 > entry_SYSCALL_64_after_hwframe+0x49/0xb3 > > > the dependencies between the lock to be acquired > and SOFTIRQ-irq-unsafe lock: > -> (shmlock_user_lock){+.+.}-{2:2} { > HARDIRQ-ON-W at: > lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 > __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:4923 > __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:4923 > __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: [<ffffffff89a5e858>] shmlock_user_lock+0x18/0x5c0 > ... 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 > > -> (&info->lock){....}-{2:2} { > INITIAL USE at: > lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 > __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:3302 > __generic_file_write_iter+0x24c/0x610 mm/filemap.c:3431 > generic_file_write_iter+0x3f3/0x630 mm/filemap.c:3463 > call_write_iter include/linux/fs.h:1907 [inline] > new_sync_write+0x4a2/0x700 fs/read_write.c:483 > __vfs_write+0xc9/0x100 fs/read_write.c:496 > vfs_write+0x268/0x5d0 fs/read_write.c:558 > ksys_write+0x12d/0x250 fs/read_write.c:611 > do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 > entry_SYSCALL_64_after_hwframe+0x49/0xb3 > } > ... key at: [<ffffffff8c667e80>] __key.56422+0x0/0x40 > ... acquired at: > lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 > __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 > do_sys_ftruncate+0x4a5/0x570 fs/open.c:195 > do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 > entry_SYSCALL_64_after_hwframe+0x49/0xb3 > > > stack backtrace: > CPU: 0 PID: 8337 Comm: syz-executor428 Not tainted 5.6.0-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_bad_irq_dependency kernel/locking/lockdep.c:2132 [inline] > check_irq_usage.cold+0x566/0x6de kernel/locking/lockdep.c:2330 > check_prev_add kernel/locking/lockdep.c:2519 [inline] > check_prevs_add kernel/locking/lockdep.c:2620 [inline] > validate_chain kernel/locking/lockdep.c:3237 [inline] > __lock_acquire+0x2c39/0x4e00 kernel/locking/lockdep.c:4344 > lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4923 > __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 > do_sys_ftruncate+0x4a5/0x570 fs/open.c:195 > do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 > entry_SYSCALL_64_after_hwframe+0x49/0xb3 > RIP: 0033:0x44e769 > Code: 4d c9 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 1b c9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fe511b3fce8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d > RAX: ffffffffffffffda RBX: 00000000006e1c68 RCX: 000000000044e769 > RDX: 000000000044e769 RSI: 00000000000001ff RDI: 0000000000000006 > RBP: 00000000006e1c60 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e1c6c > R13: 00007ffce699f92f R14: 00007fe511b409c0 R15: 0000000000000000 > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches >
