#syz dup: WARNING: suspicious RCU usage in get_timespec64 On Sun, Apr 04, 2021 at 01:55:17PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 5e46d1b7 reiserfs: update reiserfs_xattrs_initialized() co.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10808831d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=78ef1d159159890 > dashboard link: https://syzkaller.appspot.com/bug?extid=cb293a00f01b422bac7d > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+cb293a00f01b422bac7d@xxxxxxxxxxxxxxxxxxxxxxxxx > > ============================= > WARNING: suspicious RCU usage > 5.12.0-rc5-syzkaller #0 Not tainted > ----------------------------- > kernel/sched/core.c:8294 Illegal context switch in RCU-bh read-side critical section! > > other info that might help us debug this: > > > rcu_scheduler_active = 2, debug_locks = 0 > 7 locks held by syz-executor.2/17885: > #0: > ffff888014000930 > ( > &f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 > #1: ffff88802455a460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0x12d/0x250 fs/read_write.c:658 > #2: ffff888080e91888 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] > #2: ffff888080e91888 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: ext4_dio_write_iter fs/ext4/file.c:493 [inline] > #2: ffff888080e91888 (&sb->s_type->i_mutex_key#9){+.+.}-{3:3}, at: ext4_file_write_iter+0xaeb/0x14e0 fs/ext4/file.c:661 > #3: ffff888080e91678 (&ei->i_data_sem){++++}-{3:3}, at: ext4_map_blocks+0x5e1/0x17d0 fs/ext4/inode.c:631 > #4: ffffffff8bf718a0 (rcu_read_lock){....}-{1:2}, at: ieee80211_rx_napi+0x0/0x3d0 arch/x86/include/asm/bitops.h:207 > #5: ffff88807b381580 (&local->rx_path_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:359 [inline] > #5: ffff88807b381580 (&local->rx_path_lock){+.-.}-{2:2}, at: ieee80211_rx_handlers+0xd7/0xae60 net/mac80211/rx.c:3758 > #6: ffff8880b9d26358 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1541 [inline] > #6: ffff8880b9d26358 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x243/0xe40 kernel/time/hrtimer.c:1601 > > stack backtrace: > CPU: 1 PID: 17885 Comm: syz-executor.2 Not tainted 5.12.0-rc5-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:79 [inline] > dump_stack+0x141/0x1d7 lib/dump_stack.c:120 > ___might_sleep+0x229/0x2c0 kernel/sched/core.c:8294 > __ext4_handle_dirty_metadata+0x37/0x730 fs/ext4/ext4_jbd2.c:326 > ext4_mb_mark_diskspace_used+0x991/0x1160 fs/ext4/mballoc.c:3279 > ext4_mb_new_blocks+0xd46/0x51a0 fs/ext4/mballoc.c:5000 > ext4_new_meta_blocks+0x2fe/0x360 fs/ext4/balloc.c:693 > ext4_alloc_branch fs/ext4/indirect.c:335 [inline] > ext4_ind_map_blocks+0xb0d/0x2450 fs/ext4/indirect.c:626 > ext4_map_blocks+0x9c9/0x17d0 fs/ext4/inode.c:640 > ext4_iomap_alloc fs/ext4/inode.c:3428 [inline] > ext4_iomap_begin+0x463/0x7a0 fs/ext4/inode.c:3478 > iomap_apply+0x177/0xb50 fs/iomap/apply.c:46 > __iomap_dio_rw+0x71b/0x1280 fs/iomap/direct-io.c:553 > iomap_dio_rw+0x30/0x90 fs/iomap/direct-io.c:641 > ext4_dio_write_iter fs/ext4/file.c:551 [inline] > ext4_file_write_iter+0xe18/0x14e0 fs/ext4/file.c:661 > call_write_iter include/linux/fs.h:1977 [inline] > new_sync_write+0x426/0x650 fs/read_write.c:518 > vfs_write+0x796/0xa30 fs/read_write.c:605 > ksys_write+0x12d/0x250 fs/read_write.c:658 > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x466459 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fadff8ad188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 > RDX: 0000000000248800 RSI: 0000000020000000 RDI: 0000000000000005 > RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 > R13: 00007ffc9e5e3caf R14: 00007fadff8ad300 R15: 0000000000022000 > > > --- > This report 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 issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
