On Wed, Jul 18, 2018 at 12:49 PM, Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote: > Dmitry, > > this is yet another example of stalling inside __bread_gfp(). > > Can you find all reports where NMI backtrace contains __bread_gfp ? > > I need to wget all reports if I try to do that on my side. > If you can locally grep on your side, it will be nice. No, I don't have grep. But here are some of the matches: https://groups.google.com/forum/#!searchin/syzkaller-bugs/__bread_gfp%7Csort:date https://groups.google.com/forum/#!searchin/syzkaller-upstream-moderation/__bread_gfp%7Csort:date > On 2018/07/18 19:38, syzbot wrote: >> CPU: 1 PID: 19991 Comm: syz-executor1 Not tainted 4.18.0-rc5+ #152 >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 >> RIP: 0010:__lock_is_held+0x76/0x140 kernel/locking/lockdep.c:3741 >> Code: 00 00 4c 8b 6d c8 4d 8d b4 24 38 08 00 00 45 31 ff 48 b8 00 00 00 00 00 fc ff df 49 c1 ed 03 49 01 c5 41 8b 84 24 30 08 00 00 <85> c0 7f 24 e9 85 00 00 00 41 0f b6 45 00 41 83 c7 01 84 c0 74 08 >> RSP: 0018:ffff88018ea3eed8 EFLAGS: 00000086 >> RAX: 0000000000000001 RBX: 0000000000000286 RCX: ffffc9000443f000 >> RDX: 1ffff10031c245de RSI: 00000000ffffffff RDI: ffffffff88f925e0 >> RBP: ffff88018ea3ef18 R08: ffff88018e1226c0 R09: ffffed003b5e46d6 >> R10: 0000000000000003 R11: 0000000000000001 R12: ffff88018e1226c0 >> R13: ffffed0031c245de R14: ffff88018e122ef8 R15: 0000000000000000 >> FS: 00007f243a415700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: ffffffffff600400 CR3: 00000001d8749000 CR4: 00000000001406e0 >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> Call Trace: >> lock_is_held_type+0x121/0x210 kernel/locking/lockdep.c:3962 >> lock_is_held include/linux/lockdep.h:344 [inline] >> ___might_sleep+0x295/0x330 kernel/sched/core.c:6152 >> __might_sleep+0x95/0x190 kernel/sched/core.c:6140 >> lock_page include/linux/pagemap.h:481 [inline] >> pagecache_get_page+0x787/0xe40 mm/filemap.c:1554 >> find_or_create_page include/linux/pagemap.h:322 [inline] >> grow_dev_page fs/buffer.c:940 [inline] >> grow_buffers fs/buffer.c:1009 [inline] >> __getblk_slow fs/buffer.c:1036 [inline] >> __getblk_gfp+0x3bb/0xb10 fs/buffer.c:1313 >> __bread_gfp+0x2d/0x310 fs/buffer.c:1347 >> sb_bread_unmovable include/linux/buffer_head.h:313 [inline] >> ext4_fill_super+0x6de/0xda80 fs/ext4/super.c:3541 >> mount_bdev+0x30c/0x3e0 fs/super.c:1174 >> ext4_mount+0x34/0x40 fs/ext4/super.c:5844 >> mount_fs+0xae/0x328 fs/super.c:1277 >> vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 >> vfs_kern_mount fs/namespace.c:1027 [inline] >> do_new_mount fs/namespace.c:2518 [inline] >> do_mount+0x581/0x30e0 fs/namespace.c:2848 >> ksys_mount+0x12d/0x140 fs/namespace.c:3064 >> __do_sys_mount fs/namespace.c:3078 [inline] >> __se_sys_mount fs/namespace.c:3075 [inline] >> __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 >> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 >> entry_SYSCALL_64_after_hwframe+0x49/0xbe
