Re: BUG: unable to handle kernel NULL pointer dereference in gfs2_evict_inode

From: Wei Chen
Date: Mon Oct 31 2022 - 09:25:46 EST

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Previous message: Steven Rostedt: "Re: [BUG] NULL pointer dereference probably caused by kernel/trace/ring_buffer.c"
In reply to: Wei Chen: "BUG: unable to handle kernel NULL pointer dereference in gfs2_evict_inode"
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Dear Linux developers,

Here is the link to the reproducers.

C reproducer: https://drive.google.com/file/d/1P9GsW2pvEN_tvn89RYsrgnv2uDz3_6iq/view?usp=share_link
Syz reproducer:
https://drive.google.com/file/d/1Be-QEZ-hfj_CXhXlSEvzbf3E89HmkVMH/view?usp=share_link

The bug persists in the latest commit, v5.15.76 (4f5365f77018). I hope
it is helpful to you.

[ 83.919419][ T6891] function = gfs2_dirent_scan, file =
fs/gfs2/dir.c, line = 602
[ 83.923713][ T6891] gfs2: fsid=syz:syz.0: about to withdraw this file system
[ 83.929444][ T6891] gfs2: fsid=syz:syz.0: File system withdrawn
[ 83.931468][ T6891] CPU: 1 PID: 6891 Comm: a.out Not tainted 5.15.76 #5
[ 83.933492][ T6891] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014
[ 83.936328][ T6891] Call Trace:
[ 83.937107][ T6891] <TASK>
[ 83.937780][ T6891] dump_stack_lvl+0x8d/0xcf
[ 83.938843][ T6891] gfs2_withdraw+0x212/0x730
[ 83.939908][ T6891] ? gfs2_dirent_scan+0x158/0x1a0
[ 83.941070][ T6891] gfs2_dirent_scan+0x158/0x1a0
[ 83.942185][ T6891] ? do_filldir_main.isra.21+0x1e0/0x1e0
[ 83.943476][ T6891] ? do_filldir_main.isra.21+0x1e0/0x1e0
[ 83.944765][ T6891] gfs2_dirent_search+0x156/0x2b0
[ 83.945928][ T6891] gfs2_dir_search+0x4a/0x120
[ 83.947005][ T6891] gfs2_lookupi+0x1ec/0x2c0
[ 83.948042][ T6891] ? gfs2_lookupi+0x12d/0x2c0
[ 83.949127][ T6891] ? gfs2_lookup_simple+0x57/0x90
[ 83.950403][ T6891] gfs2_lookup_simple+0x57/0x90
[ 83.951522][ T6891] init_inodes+0x6c/0xfd0
[ 83.952527][ T6891] ? snprintf+0x66/0x90
[ 83.953544][ T6891] ? gfs2_fill_super+0xa4d/0x1080
[ 83.954695][ T6891] gfs2_fill_super+0xa4d/0x1080
[ 83.955809][ T6891] ? gfs2_glock_nq_num+0x8f/0xe0
[ 83.956946][ T6891] ? snprintf+0x66/0x90
[ 83.957905][ T6891] ? set_blocksize+0x100/0x130
[ 83.959011][ T6891] ? gfs2_reconfigure+0x4c0/0x4c0
[ 83.960164][ T6891] ? get_tree_bdev+0x1c9/0x310
[ 83.961270][ T6891] get_tree_bdev+0x1c9/0x310
[ 83.962579][ T6891] gfs2_get_tree+0x24/0xc0
[ 83.963992][ T6891] vfs_get_tree+0x28/0x100
[ 83.965423][ T6891] path_mount+0x926/0xce0
[ 83.966878][ T6891] ? putname+0x83/0xa0
[ 83.968251][ T6891] do_mount+0x92/0xb0
[ 83.969599][ T6891] __x64_sys_mount+0xb0/0x120
[ 83.971115][ T6891] do_syscall_64+0x34/0xb0
[ 83.972527][ T6891] entry_SYSCALL_64_after_hwframe+0x61/0xcb
[ 83.974433][ T6891] RIP: 0033:0x7f4669d7f48a
[ 83.975836][ T6891] Code: 48 8b 0d 11 fa 2a 00 f7 d8 64 89 01 48 83
c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5
00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d de f9 2a 00 f7 d8
64 89 01 48
[ 83.982060][ T6891] RSP: 002b:00007f466a46bd38 EFLAGS: 00000282
ORIG_RAX: 00000000000000a5
[ 83.984695][ T6891] RAX: ffffffffffffffda RBX: 0000000000000000
RCX: 00007f4669d7f48a
[ 83.986856][ T6891] RDX: 0000000020000000 RSI: 0000000020000100
RDI: 00007f466a46be70
[ 83.988696][ T6891] RBP: 00007f466a46bef0 R08: 00007f466a46bd70
R09: 0000000000000000
[ 83.990534][ T6891] R10: 0000000000000000 R11: 0000000000000282
R12: 00007ffd64dee9fe
[ 83.992369][ T6891] R13: 00007ffd64dee9ff R14: 00007f466a44c000
R15: 0000000000000003
[ 83.994218][ T6891] </TASK>
[ 83.997025][ T6891] gfs2: fsid=syz:syz.0: can't lookup journal index: 0
[ 83.998884][ T6891] BUG: kernel NULL pointer dereference, address:
000000000000008c
[ 84.000696][ T6891] #PF: supervisor read access in kernel mode
[ 84.002075][ T6891] #PF: error_code(0x0000) - not-present page
[ 84.003452][ T6891] PGD 109056067 P4D 109056067 PUD 109057067 PMD 0
[ 84.004955][ T6891] Oops: 0000 [#1] PREEMPT SMP
[ 84.006026][ T6891] CPU: 1 PID: 6891 Comm: a.out Not tainted 5.15.76 #5
[ 84.007585][ T6891] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014
[ 84.010444][ T6891] RIP: 0010:gfs2_evict_inode+0x39f/0x910
[ 84.011742][ T6891] Code: 02 37 ff be 01 00 00 00 48 89 df e8 ab 38
60 ff 48 8b bb b8 04 00 00 31 f6 e8 7d 95 fd ff 49 8b 87 00 09 00 00
31 f6 4c 89 ff <8b> 90 8c 00 00 00 e8 56 43 00 00 85 c0 89 85 60 ff ff
ff 75 25 e8
[ 84.016251][ T6891] RSP: 0018:ffffc900025d3b00 EFLAGS: 00010246
[ 84.017655][ T6891] RAX: 0000000000000000 RBX: ffff88810cb10650
RCX: 0000000000000000
[ 84.019490][ T6891] RDX: ffff88810ab15340 RSI: 0000000000000000
RDI: ffff88810c1bc000
[ 84.021329][ T6891] RBP: ffffc900025d3bb0 R08: 0000000000000001
R09: 0000000000000000
[ 84.023160][ T6891] R10: ffffc900025d38f8 R11: 0000000000000001
R12: ffff88810cb10b88
[ 84.024992][ T6891] R13: ffff88810cb10878 R14: ffff88810c1bc000
R15: ffff88810c1bc000
[ 84.026825][ T6891] FS: 00007f466a46c700(0000)
GS:ffff88813dc00000(0000) knlGS:0000000000000000
[ 84.028869][ T6891] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 84.030382][ T6891] CR2: 000000000000008c CR3: 000000010c054000
CR4: 00000000003506e0
[ 84.032206][ T6891] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[ 84.034034][ T6891] DR3: 0000000000000000 DR6: 00000000fffe0ff0
DR7: 0000000000000400
[ 84.035859][ T6891] Call Trace:
[ 84.036615][ T6891] <TASK>
[ 84.037294][ T6891] ? find_held_lock+0x2d/0x90
[ 84.038375][ T6891] ? gfs2_evict_inode+0x2c7/0x910
[ 84.039537][ T6891] ? evict_unlinked_inode+0x380/0x380
[ 84.040773][ T6891] ? evict+0xfd/0x1e0
[ 84.041694][ T6891] evict+0xfd/0x1e0
[ 84.042571][ T6891] ? gfs2_glock_put_eventually+0x40/0x40
[ 84.043866][ T6891] iput.part.20+0x217/0x3a0
[ 84.044949][ T6891] iput+0x29/0x40
[ 84.045790][ T6891] dentry_unlink_inode+0x163/0x170
[ 84.046971][ T6891] __dentry_kill+0x137/0x220
[ 84.048032][ T6891] ? dput+0x32/0x650
[ 84.048936][ T6891] dput+0x42b/0x650
[ 84.049814][ T6891] gfs2_fill_super+0xa94/0x1080
[ 84.050932][ T6891] ? gfs2_glock_nq_num+0x8f/0xe0
[ 84.052068][ T6891] ? snprintf+0x66/0x90
[ 84.053036][ T6891] ? set_blocksize+0x100/0x130
[ 84.054137][ T6891] ? gfs2_reconfigure+0x4c0/0x4c0
[ 84.055292][ T6891] ? get_tree_bdev+0x1c9/0x310
[ 84.056391][ T6891] get_tree_bdev+0x1c9/0x310
[ 84.057457][ T6891] gfs2_get_tree+0x24/0xc0
[ 84.058474][ T6891] vfs_get_tree+0x28/0x100
[ 84.059489][ T6891] path_mount+0x926/0xce0
[ 84.060486][ T6891] ? putname+0x83/0xa0
[ 84.061432][ T6891] do_mount+0x92/0xb0
[ 84.062353][ T6891] __x64_sys_mount+0xb0/0x120
[ 84.063437][ T6891] do_syscall_64+0x34/0xb0
[ 84.064455][ T6891] entry_SYSCALL_64_after_hwframe+0x61/0xcb
[ 84.065811][ T6891] RIP: 0033:0x7f4669d7f48a
[ 84.066822][ T6891] Code: 48 8b 0d 11 fa 2a 00 f7 d8 64 89 01 48 83
c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5
00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d de f9 2a 00 f7 d8
64 89 01 48
[ 84.071310][ T6891] RSP: 002b:00007f466a46bd38 EFLAGS: 00000282
ORIG_RAX: 00000000000000a5
[ 84.073242][ T6891] RAX: ffffffffffffffda RBX: 0000000000000000
RCX: 00007f4669d7f48a
[ 84.075069][ T6891] RDX: 0000000020000000 RSI: 0000000020000100
RDI: 00007f466a46be70
[ 84.076892][ T6891] RBP: 00007f466a46bef0 R08: 00007f466a46bd70
R09: 0000000000000000
[ 84.078724][ T6891] R10: 0000000000000000 R11: 0000000000000282
R12: 00007ffd64dee9fe
[ 84.080598][ T6891] R13: 00007ffd64dee9ff R14: 00007f466a44c000
R15: 0000000000000003
[ 84.082437][ T6891] </TASK>
[ 84.083141][ T6891] Modules linked in:
[ 84.084084][ T6891] CR2: 000000000000008c
[ 84.085089][ T6891] ---[ end trace 7249ef596cc64205 ]---
[ 84.086343][ T6891] RIP: 0010:gfs2_evict_inode+0x39f/0x910
[ 84.087642][ T6891] Code: 02 37 ff be 01 00 00 00 48 89 df e8 ab 38
60 ff 48 8b bb b8 04 00 00 31 f6 e8 7d 95 fd ff 49 8b 87 00 09 00 00
31 f6 4c 89 ff <8b> 90 8c 00 00 00 e8 56 43 00 00 85 c0 89 85 60 ff ff
ff 75 25 e8
[ 84.092183][ T6891] RSP: 0018:ffffc900025d3b00 EFLAGS: 00010246
[ 84.093581][ T6891] RAX: 0000000000000000 RBX: ffff88810cb10650
RCX: 0000000000000000
[ 84.095407][ T6891] RDX: ffff88810ab15340 RSI: 0000000000000000
RDI: ffff88810c1bc000
[ 84.097245][ T6891] RBP: ffffc900025d3bb0 R08: 0000000000000001
R09: 0000000000000000
[ 84.099079][ T6891] R10: ffffc900025d38f8 R11: 0000000000000001
R12: ffff88810cb10b88
[ 84.100917][ T6891] R13: ffff88810cb10878 R14: ffff88810c1bc000
R15: ffff88810c1bc000
[ 84.102756][ T6891] FS: 00007f466a46c700(0000)
GS:ffff88813dc00000(0000) knlGS:0000000000000000
[ 84.104808][ T6891] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 84.106320][ T6891] CR2: 000000000000008c CR3: 000000010c054000
CR4: 00000000003506e0
[ 84.108160][ T6891] DR0: 0000000000000000 DR1: 0000000000000000
DR2: 0000000000000000
[ 84.109992][ T6891] DR3: 0000000000000000 DR6: 00000000fffe0ff0
DR7: 0000000000000400
[ 84.111822][ T6891] Kernel panic - not syncing: Fatal exception
[ 84.113908][ T6891] Kernel Offset: disabled
[ 84.114912][ T6891] Rebooting in 86400 seconds..

Best,
Wei

Next message: Sudeep Holla: "Re: [PATCH v2 7/8] hwmon: (scmi) Register explicitly with Thermal Framework"
Previous message: Steven Rostedt: "Re: [BUG] NULL pointer dereference probably caused by kernel/trace/ring_buffer.c"
In reply to: Wei Chen: "BUG: unable to handle kernel NULL pointer dereference in gfs2_evict_inode"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]