Messages in this thread | | | From | Dmitry Vyukov <> | Date | Wed, 23 Dec 2015 17:01:29 +0100 | Subject | 9p: sleeping function called from invalid context in v9fs_vfs_atomic_open_dotl |
| |
Hello,
While running syzkaller fuzzer inside of lkvm-based VM I constantly hit the following warnings:
BUG: sleeping function called from invalid context at include/linux/wait.h:1095 in_atomic(): 1, irqs_disabled(): 0, pid: 3658, name: syz-fuzzer 3 locks held by syz-fuzzer/3658: #0: (sb_writers#3){.+.+.+}, at: [<ffffffff8171912c>] __sb_start_write+0xec/0x130 fs/super.c:1198 #1: (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<ffffffff8173fcf0>] path_openat+0x2700/0x54a0 fs/namei.c:3323 #2: (&(&v9inode->fscache_lock)->rlock){+.+...}, at: [<ffffffff8218ae88>] v9fs_cache_inode_set_cookie+0x58/0x180 fs/9p/cache.c:246 CPU: 0 PID: 3658 Comm: syz-fuzzer Not tainted 4.4.0-rc6+ #174 00000000ffffffff ffff88006045f870 ffffffff82899ffd ffff88006b10b180 ffff88006b10b790 0000000000000000 ffff88006045f898 ffffffff81361e68 ffff88006b10b180 ffffffff85deaf40 0000000000000447 ffff88006045f8d8 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff82899ffd>] dump_stack+0x6f/0xa2 lib/dump_stack.c:50 [<ffffffff81361e68>] ___might_sleep+0x278/0x3a0 kernel/sched/core.c:7597 [<ffffffff81362020>] __might_sleep+0x90/0x1a0 kernel/sched/core.c:7559 [< inline >] wait_on_bit_lock include/linux/wait.h:1095 [<ffffffff818a8f0c>] __fscache_disable_cookie+0xfc/0x540 fs/fscache/cookie.c:527 [<ffffffff818aaaa4>] __fscache_relinquish_cookie+0xb4/0x640 fs/fscache/cookie.c:601 [< inline >] fscache_relinquish_cookie include/linux/fscache.h:370 [< inline >] v9fs_cache_inode_flush_cookie fs/9p/cache.c:235 [<ffffffff8218aef2>] v9fs_cache_inode_set_cookie+0xc2/0x180 fs/9p/cache.c:249 [<ffffffff8218195d>] v9fs_vfs_atomic_open_dotl+0x6ed/0x7e0 fs/9p/vfs_inode_dotl.c:357 [< inline >] lookup_open fs/namei.c:2847 [< inline >] do_last fs/namei.c:3083 [<ffffffff817416d6>] path_openat+0x40e6/0x54a0 fs/namei.c:3323 [<ffffffff8174604e>] do_filp_open+0x18e/0x250 fs/namei.c:3358 [<ffffffff8170e560>] do_sys_open+0x200/0x430 fs/open.c:1025 [< inline >] SYSC_openat fs/open.c:1052 [<ffffffff8170e800>] SyS_openat+0x30/0x40 fs/open.c:1046 [<ffffffff85c8a9f6>] entry_SYSCALL_64_fastpath+0x16/0x7a arch/x86/entry/entry_64.S:185
Kernel is on commit 4ef7675344d687a0ef5b0d7c0cee12da005870c0 (Dec 20); kvmtool is on 3c8aec9e2b5066412390559629dabeb7816ee8f2 (Nov 30).
| |