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Date: Thu, 13 Apr 2023 05:55:07 -0400
From: xiaoshoukui <xiaoshoukui@...il.com>
To: clm@...com, josef@...icpanda.com, dsterba@...e.com
Cc: linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
xiaoshoukui <xiaoshoukui@...il.com>,
xiaoshoukui <xiaoshoukui@...jie.com.cn>
Subject: [PATCH v2] btrfs: ioctl: ASSERT in btrfs_exclop_balance should also check for NONE and BALANCE PAUSED status.
Cocurrently issue add device requests, btrfs_exclop_balance in
btrfs_ioctl_add_dev can race to btrfs_exclop_finish or itself.
Link: https://lore.kernel.org/linux-btrfs/20230324031611.98986-1-xiaoshoukui@gmail.com/
---
Changelog:
v2: Add check for NONE and btrfs_info.
> btrfs_info(fs_info, "fs_info exclusive_operation: %d",
> fs_info->exclusive_operation);
> ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE ||
> fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD ||
> fs_info->exclusive_operation == BTRFS_EXCLOP_NONE);
Stack traces:
root@...kaller:/home/xsk# ./repro
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
[ 416.611428][ T7970] BTRFS info (device loop0): fs_info exclusive_operation: 0
Failed to add device /dev/vda, errno 14
[ 416.613973][ T7971] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.615456][ T7972] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.617528][ T7973] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.618359][ T7974] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.622589][ T7975] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.624034][ T7976] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.626420][ T7977] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.627643][ T7978] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.629006][ T7979] BTRFS info (device loop0): fs_info exclusive_operation: 3
[ 416.630298][ T7980] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
[ 416.632787][ T7981] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.634282][ T7982] BTRFS info (device loop0): fs_info exclusive_operation: 3
Failed to add device /dev/vda, errno 14
[ 416.636202][ T7983] BTRFS info (device loop0): fs_info exclusive_operation: 3
[ 416.637012][ T7984] BTRFS info (device loop0): fs_info exclusive_operation: 1
Failed to add device /dev/vda, errno 14
[ 416.637759][ T7984] assertion failed: fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD || fs_info->exclusive_operation == BTRFS_EXCLOP_NONE, in fs/btrfs/ioctl.c:458
[ 416.639845][ T7984] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[ 416.640485][ T7984] CPU: 0 PID: 7984 Comm: repro Not tainted 6.2.0 #7
[ 416.641172][ T7984] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
[ 416.642090][ T7984] RIP: 0010:btrfs_assertfail+0x2c/0x2e
[ 416.642629][ T7984] Code: 1f 00 41 55 41 89 d5 41 54 49 89 f4 55 48 89 fd e8 b9 84 e8 f7 44 89 e9 4c 89 e2 48 89 ee 48 c7 c7 c0 af 54 8a e8 cb 49 f3 ff <0f> 0b 66 0f 1f 00 55 48 89 fd e8 95 84 e8 f7 48 89 ef 5d 48 c7 c6
[ 416.644423][ T7984] RSP: 0018:ffffc90003ea7e28 EFLAGS: 00010282
[ 416.645018][ T7984] RAX: 00000000000000cc RBX: 0000000000000000 RCX: 0000000000000000
[ 416.645763][ T7984] RDX: ffff88801d030000 RSI: ffffffff81637e7c RDI: fffff520007d4fb7
[ 416.646554][ T7984] RBP: ffffffff8a533de0 R08: 00000000000000cc R09: 0000000000000000
[ 416.647299][ T7984] R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8a533da0
[ 416.648041][ T7984] R13: 00000000000001ca R14: 000000005000940a R15: 0000000000000000
[ 416.648785][ T7984] FS: 00007fa2985d4640(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
[ 416.649616][ T7984] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 416.650238][ T7984] CR2: 0000000000000000 CR3: 0000000018e5e000 CR4: 0000000000750ef0
[ 416.650980][ T7984] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 416.651725][ T7984] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 416.652502][ T7984] PKRU: 55555554
[ 416.652888][ T7984] Call Trace:
[ 416.653241][ T7984] <TASK>
[ 416.653527][ T7984] btrfs_exclop_balance+0x240/0x410
[ 416.654036][ T7984] ? memdup_user+0xab/0xc0
[ 416.654465][ T7984] ? PTR_ERR+0x17/0x20
[ 416.654874][ T7984] btrfs_ioctl_add_dev+0x2ee/0x320
[ 416.655380][ T7984] btrfs_ioctl+0x9d5/0x10d0
[ 416.655822][ T7984] ? btrfs_ioctl_encoded_write+0xb80/0xb80
[ 416.656400][ T7984] __x64_sys_ioctl+0x197/0x210
[ 416.656874][ T7984] do_syscall_64+0x3c/0xb0
[ 416.657346][ T7984] entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 416.657922][ T7984] RIP: 0033:0x4546af
[ 416.658304][ T7984] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 77 1f 48 8b 44 24 18 64 48 2b 04 25 28 00
[ 416.660170][ T7984] RSP: 002b:00007fa2985d4150 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 416.660972][ T7984] RAX: ffffffffffffffda RBX: 00007fa2985d4640 RCX: 00000000004546af
[ 416.661714][ T7984] RDX: 0000000000000000 RSI: 000000005000940a RDI: 0000000000000003
[ 416.662449][ T7984] RBP: 00007fa2985d41d0 R08: 0000000000000000 R09: 00007ffee37a4c4f
[ 416.663195][ T7984] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa2985d4640
[ 416.663951][ T7984] R13: 0000000000000009 R14: 000000000041b320 R15: 00007fa297dd4000
[ 416.664703][ T7984] </TASK>
[ 416.665040][ T7984] Modules linked in:
[ 416.665590][ T7984] ---[ end trace 0000000000000000 ]---
[ 416.666176][ T7984] RIP: 0010:btrfs_assertfail+0x2c/0x2e
[ 416.666774][ T7984] Code: 1f 00 41 55 41 89 d5 41 54 49 89 f4 55 48 89 fd e8 b9 84 e8 f7 44 89 e9 4c 89 e2 48 89 ee 48 c7 c7 c0 af 54 8a e8 cb 49 f3 ff <0f> 0b 66 0f 1f 00 55 48 89 fd e8 95 84 e8 f7 48 89 ef 5d 48 c7 c6
[ 416.668775][ T7984] RSP: 0018:ffffc90003ea7e28 EFLAGS: 00010282
[ 416.669425][ T7984] RAX: 00000000000000cc RBX: 0000000000000000 RCX: 0000000000000000
[ 416.670235][ T7984] RDX: ffff88801d030000 RSI: ffffffff81637e7c RDI: fffff520007d4fb7
[ 416.671050][ T7984] RBP: ffffffff8a533de0 R08: 00000000000000cc R09: 0000000000000000
[ 416.671867][ T7984] R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8a533da0
[ 416.672685][ T7984] R13: 00000000000001ca R14: 000000005000940a R15: 0000000000000000
[ 416.673501][ T7984] FS: 00007fa2985d4640(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
[ 416.674425][ T7984] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 416.675114][ T7984] CR2: 0000000000000000 CR3: 0000000018e5e000 CR4: 0000000000750ef0
[ 416.675933][ T7984] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 416.676760][ T7984] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 416.677544][ T7984] PKRU: 55555554
[ 416.677885][ T7984] Kernel panic - not syncing: Fatal exception
[ 416.678592][ T7984] Kernel Offset: disabled
[ 416.679008][ T7984] Rebooting in 86400 seconds..
v1: Didn't check for NONE and BTRFS_EXCLOP_BALANCE_PAUSED status.
Stack traces:
root@...kaller:/home/xsk# ./repro
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
Failed to add device /dev/vda, errno 14
[ 69.838916][ T8108] assertion failed: fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE || fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD, in fs/btrfs/ioctl.c:456
[ 69.840759][ T8108] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[ 69.841461][ T8108] CPU: 0 PID: 8108 Comm: repro Not tainted 6.2.0 #5
[ 69.842245][ T8108] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
[ 69.843292][ T8108] RIP: 0010:btrfs_assertfail+0x2c/0x2e
[ 69.843899][ T8108] Code: 1f 00 41 55 41 89 d5 41 54 49 89 f4 55 48 89 fd e8 b9 84 e8 f7 44 89 e9 4c 89 e2 48 89 ee 48 c7 c7 20 af 54 8a e8 cb 49 f3 ff <0f> 0b 66 0f 1f 00 55 48 89 fd e8 95 84 e8 f7 48 89 ef 5d 48 c7 c6
[ 69.845934][ T8108] RSP: 0018:ffffc90005f1fe28 EFLAGS: 00010282
[ 69.846588][ T8108] RAX: 0000000000000097 RBX: 0000000000000000 RCX: 0000000000000000
[ 69.847426][ T8108] RDX: ffff88801e8b2440 RSI: ffffffff81637e7c RDI: fffff52000be3fb7
[ 69.848267][ T8108] RBP: ffffffff8a533d80 R08: 0000000000000097 R09: 0000000000000000
[ 69.849103][ T8108] R10: 0000000080000001 R11: 0000000000000001 R12: ffffffff8a533d40
[ 69.849945][ T8108] R13: 00000000000001c8 R14: 000000005000940a R15: 0000000000000000
[ 69.850792][ T8108] FS: 00007ff3e2004640(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
[ 69.851747][ T8108] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 69.852457][ T8108] CR2: 0000000000000000 CR3: 00000000182c8000 CR4: 0000000000750ef0
[ 69.853311][ T8108] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 69.854167][ T8108] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 69.854935][ T8108] PKRU: 55555554
[ 69.855263][ T8108] Call Trace:
[ 69.855575][ T8108] <TASK>
[ 69.855851][ T8108] btrfs_exclop_balance+0x13c/0x310
[ 69.856337][ T8108] ? memdup_user+0xab/0xc0
[ 69.856749][ T8108] ? PTR_ERR+0x17/0x20
[ 69.857138][ T8108] btrfs_ioctl_add_dev+0x2ee/0x320
[ 69.857716][ T8108] btrfs_ioctl+0x9d5/0x10d0
[ 69.858222][ T8108] ? btrfs_ioctl_encoded_write+0xb80/0xb80
[ 69.858801][ T8108] __x64_sys_ioctl+0x197/0x210
[ 69.859253][ T8108] do_syscall_64+0x3c/0xb0
[ 69.859668][ T8108] entry_SYSCALL_64_after_hwframe+0x63/0xcd
[ 69.860217][ T8108] RIP: 0033:0x4546af
[ 69.860582][ T8108] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 77 1f 48 8b 44 24 18 64 48 2b 04 25 28 00
[ 69.862533][ T8108] RSP: 002b:00007ff3e2004150 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 69.863299][ T8108] RAX: ffffffffffffffda RBX: 00007ff3e2004640 RCX: 00000000004546af
[ 69.864025][ T8108] RDX: 0000000000000000 RSI: 000000005000940a RDI: 0000000000000003
[ 69.864739][ T8108] RBP: 00007ff3e20041d0 R08: 0000000000000000 R09: 00007ffd746cf81f
[ 69.865528][ T8108] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff3e2004640
[ 69.866375][ T8108] R13: 0000000000000009 R14: 000000000041b320 R15: 00007ff3e1804000
[ 69.867115][ T8108] </TASK>
[ 69.867411][ T8108] Modules linked in:
[ 69.867888][ T8108] ---[ end trace 0000000000000000 ]---
[ 69.868392][ T8108] RIP: 0010:btrfs_assertfail+0x2c/0x2e
[ 69.868901][ T8108] Code: 1f 00 41 55 41 89 d5 41 54 49 89 f4 55 48 89 fd e8 b9 84 e8 f7 44 89 e9 4c 89 e2 48 89 ee 48 c7 c7 20 af 54 8a e8 cb 49 f3 ff <0f> 0b 66 0f 1f 00 55 48 89 fd e8 95 84 e8 f7 48 89 ef 5d 48 c7 c6
[ 69.870857][ T8108] RSP: 0018:ffffc90005f1fe28 EFLAGS: 00010282
[ 69.871422][ T8108] RAX: 0000000000000097 RBX: 0000000000000000 RCX: 0000000000000000
[ 69.872148][ T8108] RDX: ffff88801e8b2440 RSI: ffffffff81637e7c RDI: fffff52000be3fb7
[ 69.872866][ T8108] RBP: ffffffff8a533d80 R08: 0000000000000097 R09: 0000000000000000
[ 69.873681][ T8108] R10: 0000000080000001 R11: 0000000000000001 R12: ffffffff8a533d40
[ 69.874530][ T8108] R13: 00000000000001c8 R14: 000000005000940a R15: 0000000000000000
[ 69.875270][ T8108] FS: 00007ff3e2004640(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
[ 69.876084][ T8108] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 69.876681][ T8108] CR2: 0000000000000000 CR3: 00000000182c8000 CR4: 0000000000750ef0
[ 69.877464][ T8108] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 69.878317][ T8108] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 69.879062][ T8108] PKRU: 55555554
[ 69.879400][ T8108] Kernel panic - not syncing: Fatal exception
[ 69.880096][ T8108] Kernel Offset: disabled
[ 69.880563][ T8108] Rebooting in 86400 seconds..
Signed-off-by: xiaoshoukui <xiaoshoukui@...jie.com.cn>
---
fs/btrfs/ioctl.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index a0ef1a1784c7..7df80b37bc44 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -454,7 +454,9 @@ void btrfs_exclop_balance(struct btrfs_fs_info *fs_info,
case BTRFS_EXCLOP_BALANCE_PAUSED:
spin_lock(&fs_info->super_lock);
ASSERT(fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE ||
- fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD);
+ fs_info->exclusive_operation == BTRFS_EXCLOP_DEV_ADD ||
+ fs_info->exclusive_operation == BTRFS_EXCLOP_NONE ||
+ fs_info->exclusive_operation == BTRFS_EXCLOP_BALANCE_PAUSED);
fs_info->exclusive_operation = BTRFS_EXCLOP_BALANCE_PAUSED;
spin_unlock(&fs_info->super_lock);
break;
--
2.20.1
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