Hi,
We found that the kmemleak not worked very well with KASAN enabled on linux master
We found that the kmemleak not worked very well with KASAN enabled on linux master
when we insmod and rmmod
modules frequently:
BUG: unable to handle page fault for address: fffffbfff4182000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 123fd0067 P4D 123fd0067 PUD 123fcc067 PMD 107a61067 PTE 0
Oops: 0000 [#1] SMP KASAN
CPU: 2 PID: 185 Comm: kmemleak Not tainted 5.15.0 #18
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:crc32_le_base+0x78/0x590
Code: ec 48 89 44 24 10 48 8d 44 05 fc 48 bd 00 00 00 00 00 fc ff df 48 89 04 24 e8 84 94 04 ff 49 8d 7c 24 04 48 89 f8 48 c1 e8 03 <0f> b6 14 28 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d3
RSP: 0018:ffff888012507dd0 EFLAGS: 00010806
RAX: 1ffffffff4182000 RBX: 0000000000003600 RCX: 0000000000000000
RDX: ffff8880124c0040 RSI: ffffffff823e5ddc RDI: ffffffffa0c10000
RBP: dffffc0000000000 R08: 0000000000000004 R09: ffffed10024a0fbd
R10: 0000000000000003 R11: ffffed10024a0fbd R12: ffffffffa0c0fffc
R13: ffffffffa0c0fffc R14: ffff88801dac87fc R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88810b700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff4182000 CR3: 000000004a66d005 CR4: 0000000000770ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
? _raw_spin_unlock_irqrestore+0x40/0x60
kmemleak_scan+0x735/0xca0
? scan_gray_list+0x430/0x430
? __mutex_lock_slowpath+0x10/0x10
? __mutex_unlock_slowpath.isra.18+0x320/0x320
? __kthread_parkme+0xc7/0x140
? kmemleak_write.cold.31+0x29/0x29
kmemleak_scan_thread+0x98/0xb3
kthread+0x346/0x420
? set_kthread_struct+0x110/0x110
ret_from_fork+0x1f/0x30
Modules linked in: ubi(+) nandsim [last unloaded: nandsim]
CR2: fffffbfff4182000
---[ end trace 122ede50ee8d0c8a ]---
BUG: unable to handle page fault for address: fffffbfff4182000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 123fd0067 P4D 123fd0067 PUD 123fcc067 PMD 107a61067 PTE 0
Oops: 0000 [#1] SMP KASAN
CPU: 2 PID: 185 Comm: kmemleak Not tainted 5.15.0 #18
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:crc32_le_base+0x78/0x590
Code: ec 48 89 44 24 10 48 8d 44 05 fc 48 bd 00 00 00 00 00 fc ff df 48 89 04 24 e8 84 94 04 ff 49 8d 7c 24 04 48 89 f8 48 c1 e8 03 <0f> b6 14 28 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d3
RSP: 0018:ffff888012507dd0 EFLAGS: 00010806
RAX: 1ffffffff4182000 RBX: 0000000000003600 RCX: 0000000000000000
RDX: ffff8880124c0040 RSI: ffffffff823e5ddc RDI: ffffffffa0c10000
RBP: dffffc0000000000 R08: 0000000000000004 R09: ffffed10024a0fbd
R10: 0000000000000003 R11: ffffed10024a0fbd R12: ffffffffa0c0fffc
R13: ffffffffa0c0fffc R14: ffff88801dac87fc R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88810b700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff4182000 CR3: 000000004a66d005 CR4: 0000000000770ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
? _raw_spin_unlock_irqrestore+0x40/0x60
kmemleak_scan+0x735/0xca0
? scan_gray_list+0x430/0x430
? __mutex_lock_slowpath+0x10/0x10
? __mutex_unlock_slowpath.isra.18+0x320/0x320
? __kthread_parkme+0xc7/0x140
? kmemleak_write.cold.31+0x29/0x29
kmemleak_scan_thread+0x98/0xb3
kthread+0x346/0x420
? set_kthread_struct+0x110/0x110
ret_from_fork+0x1f/0x30
Modules linked in: ubi(+) nandsim [last unloaded: nandsim]
CR2: fffffbfff4182000
---[ end trace 122ede50ee8d0c8a ]---
and we found the address
belongs to kasan shadow region. the kmemleak and kasan may not
handle concurrency very well. I have tried disable kasan
instrumentation of kmemleak but not solved it.
the problem was also found in
linux-5.10. And linux-5.10 got another stack sometimes, I'm not
sure If the problem is the same:
BUG: unable to handle page fault for address: fffffbfff40b7000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 123fd0067 P4D 123fd0067 PUD 123fcc067 PMD 10aa2c067 PTE 0
Oops: 0000 [#1] SMP KASAN
CPU: 0 PID: 179 Comm: kmemleak Tainted: G B 5.10.0-10155-g3681f87982b3-dirty #154
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:scan_block+0x5d/0x240
Code: eb 0f 83 98 01 00 00 49 bc 00 00 00 00 00 fc ff df e8 17 ff ff ff 85 c0 0f 85 81 01 00 00 e8 0a 4f fa ff 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 87 01 00 00 48 8b 2b e8 d0 4e fa ff 48 39 2d
RSP: 0018:ffff88800faa7db8 EFLAGS: 00010806
RAX: 1ffffffff40b7000 RBX: ffffffffa05b8000 RCX: ffffffff811f89cb
RDX: 1ffff110204991a0 RSI: 0000000000000008 RDI: ffff8881024c8d00
RBP: ffffffffa05b9000 R08: ffffed10204991a1 R09: ffffed10204991a1
R10: ffff8881024c8d07 R11: ffffed10204991a0 R12: dffffc0000000000
R13: ffffffffa05b8ff9 R14: ffff8880457e1488 R15: 0000000000000046
FS: 0000000000000000(0000) GS:ffff88810b400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff40b7000 CR3: 000000006e88a005 CR4: 0000000000770ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
scan_gray_list+0x25a/0x430
kmemleak_scan+0x672/0xd80
? kmemleak_seq_show+0x170/0x170
? __mutex_lock_slowpath+0x10/0x10
? kmemleak_write.cold.21+0x29/0x29
kmemleak_scan_thread+0x98/0xb3
kthread+0x32d/0x3f0
? __kthread_cancel_work+0x190/0x190
ret_from_fork+0x1f/0x30
Modules linked in: ubifs ubi nandsim [last unloaded: nandsim]
CR2: fffffbfff40b7000
---[ end trace 48e75df3be17140f ]---
Kind regards,
Yongqiang Liu
sure If the problem is the same:
BUG: unable to handle page fault for address: fffffbfff40b7000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 123fd0067 P4D 123fd0067 PUD 123fcc067 PMD 10aa2c067 PTE 0
Oops: 0000 [#1] SMP KASAN
CPU: 0 PID: 179 Comm: kmemleak Tainted: G B 5.10.0-10155-g3681f87982b3-dirty #154
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:scan_block+0x5d/0x240
Code: eb 0f 83 98 01 00 00 49 bc 00 00 00 00 00 fc ff df e8 17 ff ff ff 85 c0 0f 85 81 01 00 00 e8 0a 4f fa ff 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 87 01 00 00 48 8b 2b e8 d0 4e fa ff 48 39 2d
RSP: 0018:ffff88800faa7db8 EFLAGS: 00010806
RAX: 1ffffffff40b7000 RBX: ffffffffa05b8000 RCX: ffffffff811f89cb
RDX: 1ffff110204991a0 RSI: 0000000000000008 RDI: ffff8881024c8d00
RBP: ffffffffa05b9000 R08: ffffed10204991a1 R09: ffffed10204991a1
R10: ffff8881024c8d07 R11: ffffed10204991a0 R12: dffffc0000000000
R13: ffffffffa05b8ff9 R14: ffff8880457e1488 R15: 0000000000000046
FS: 0000000000000000(0000) GS:ffff88810b400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfff40b7000 CR3: 000000006e88a005 CR4: 0000000000770ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
scan_gray_list+0x25a/0x430
kmemleak_scan+0x672/0xd80
? kmemleak_seq_show+0x170/0x170
? __mutex_lock_slowpath+0x10/0x10
? kmemleak_write.cold.21+0x29/0x29
kmemleak_scan_thread+0x98/0xb3
kthread+0x32d/0x3f0
? __kthread_cancel_work+0x190/0x190
ret_from_fork+0x1f/0x30
Modules linked in: ubifs ubi nandsim [last unloaded: nandsim]
CR2: fffffbfff40b7000
---[ end trace 48e75df3be17140f ]---
Kind regards,
Yongqiang Liu
