Hello, On arm64 I'm seeing a regression between next-20191031 and next-20191105 that breaks boot from my btrfs rootfs: next-20191105 and later oopses on found->lock, or with CONFIG_BTRFS_ASSERT asserts on a NULL "found" variable in btrfs_update_space_info(). According to git-blame that code hasn't changed in months, and I didn't spot an obvious cause among the fs/btrfs/ commis between those two tags. [ 3.512280] sd 0:0:0:0: [sda] Attached SCSI disk [ 3.520043] BTRFS: device label rootfs devid 1 transid 490 /dev/root scanned by swapper/0 (1) [ 3.529701] BTRFS info (device sda3): disk space caching is enabled [ 3.536182] BTRFS info (device sda3): has skinny extents [ 3.547836] assertion failed: found, in fs/btrfs/space-info.c:124 [ 3.554171] ------------[ cut here ]------------ [ 3.558923] kernel BUG at fs/btrfs/ctree.h:3118! [ 3.563673] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP [ 3.569312] Modules linked in: [ 3.572465] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc6-next-20191105+ #110 [ 3.580335] Hardware name: Zidoo X9S (DT) [ 3.584463] pstate: 40000005 (nZcv daif -PAN -UAO) [ 3.589401] pc : assfail.constprop.0+0x24/0x28 [ 3.593975] lr : assfail.constprop.0+0x24/0x28 [ 3.598543] sp : ffff80001002b7d0 [ 3.601954] x29: ffff80001002b7d0 x28: 0000000000000000 [ 3.607420] x27: 0000000000000001 x26: 0000000000000001 [ 3.612885] x25: 0000000000000000 x24: ffff80001002b890 [ 3.618350] x23: 0000000000000000 x22: ffff00007c7d0000 [ 3.623815] x21: 0000000000800000 x20: 0000000000000001 [ 3.629281] x19: 0000000000000000 x18: 0000000000000000 [ 3.634746] x17: 000000009b04d1f2 x16: 0000000000000014 [ 3.640211] x15: 000000000000000a x14: 0720072007200720 [ 3.645676] x13: 0720072007200720 x12: 0720072007200720 [ 3.651141] x11: 073407320731073a x10: 0763072e076f0766 [ 3.656606] x9 : 076e0769072d0765 x8 : 0000000000000000 [ 3.662071] x7 : 0000000000000007 x6 : 0000000000000000 [ 3.667536] x5 : 0000000000000000 x4 : 0000000000000000 [ 3.673000] x3 : 0000000000000000 x2 : 00e5bec8376cfb00 [ 3.678465] x1 : 0000000000000000 x0 : 0000000000000035 [ 3.683930] Call trace: [ 3.686455] assfail.constprop.0+0x24/0x28 [ 3.690672] btrfs_update_space_info+0x5c/0xe4 [ 3.695248] btrfs_read_block_groups+0x470/0x620 [ 3.700001] open_ctree+0x1500/0x1ae8 [ 3.703775] btrfs_mount_root+0x38c/0x450 [ 3.707904] legacy_get_tree+0x2c/0x54 [ 3.711766] vfs_get_tree+0x28/0xd4 [ 3.715361] fc_mount+0x14/0x44 [ 3.718599] vfs_kern_mount.part.0+0x74/0x98 [ 3.722994] vfs_kern_mount+0x10/0x20 [ 3.726767] btrfs_mount+0x624/0x6cc [ 3.730450] legacy_get_tree+0x2c/0x54 [ 3.734312] vfs_get_tree+0x28/0xd4 [ 3.737904] do_mount+0x52c/0x728 [ 3.741318] ksys_mount+0xb4/0xc4 [ 3.744734] mount_block_root+0x12c/0x2d8 [ 3.748861] mount_root+0x7c/0x88 [ 3.752275] prepare_namespace+0x15c/0x16c [ 3.756491] kernel_init_freeable+0x1e0/0x224 [ 3.760977] kernel_init+0x10/0xf8 [ 3.764483] ret_from_fork+0x10/0x18 [ 3.768171] Code: 913f6842 b0003260 91337800 97f6e0d0 (d4210000) [ 3.774446] ---[ end trace 21d95ef2db268f8d ]--- [ 3.779221] note: swapper/0[1] exited with preempt_count 1 [ 3.784910] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 3.792786] SMP: stopping secondary CPUs [ 3.796824] Kernel Offset: disabled [ 3.800415] CPU features: 0x00002,20002004 [ 3.804626] Memory Limit: none [ 3.807780] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]--- Kindly revert the tree to some working state again. Thanks, Andreas -- SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Felix Imendörffer HRB 36809 (AG Nürnberg)
