Re: [syzbot] [block?] [trace?] INFO: task hung in blk_trace_remove (2)

From: syzbot
Date: Mon Jan 29 2024 - 20:48:12 EST

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In reply to: Edward Adam Davis: "Re: [syzbot] [block?] [trace?] INFO: task hung in blk_trace_remove (2)"
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
BUG: sleeping function called from invalid context in relay_close

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:585
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5650, name: syz-executor.4
preempt_count: 101, expected: 0
RCU nest depth: 0, expected: 0
4 locks held by syz-executor.4/5650:
#0: ffff88801f37c3d0 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:661
#1: ffffffff8d19a1c0 (console_lock){+.+.}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1923 [inline]
#1: ffffffff8d19a1c0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x162/0x5f0 kernel/printk/printk.c:2302
#2: ffffffff8d19a230 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:303 [inline]
#2: ffffffff8d19a230 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
#2: ffffffff8d19a230 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
#2: ffffffff8d19a230 (console_srcu){....}-{0:0}, at: console_flush_all+0x12d/0xd60 kernel/printk/printk.c:2959
#3: ffffffff8d1acac0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#3: ffffffff8d1acac0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2184 [inline]
#3: ffffffff8d1acac0 (rcu_callback){....}-{0:0}, at: rcu_core+0x7bd/0x1680 kernel/rcu/tree.c:2465
Preemption disabled at:
[<ffffffff816b4ebd>] vprintk_emit+0x15d/0x5f0 kernel/printk/printk.c:2295
CPU: 0 PID: 5650 Comm: syz-executor.4 Not tainted 6.8.0-rc2-syzkaller-g41bccc98fb79-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
__might_resched+0x3c3/0x5e0 kernel/sched/core.c:10176
__mutex_lock_common kernel/locking/mutex.c:585 [inline]
__mutex_lock+0xe2/0x9d0 kernel/locking/mutex.c:752
relay_close kernel/relay.c:760 [inline]
relay_close+0x36/0x5d0 kernel/relay.c:752
blk_trace_free+0x37/0x190 kernel/trace/blktrace.c:316
blk_trace_rcu_free+0x22/0x30 kernel/trace/blktrace.c:388
rcu_do_batch kernel/rcu/tree.c:2190 [inline]
rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465
__do_softirq+0x21a/0x8de kernel/softirq.c:553
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu kernel/softirq.c:632 [inline]
irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:console_flush_all+0xa11/0xd60 kernel/printk/printk.c:2973
Code: e8 84 c1 23 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 c2 db 1c 00 48 85 db 0f 85 7c 01 00 00 e8 24 e0 1c 00 fb 48 8b 04 24 <4c> 89 fa 83 e2 07 0f b6 00 38 d0 7f 08 84 c0 0f 85 55 02 00 00 41
RSP: 0018:ffffc90009d478d0 EFLAGS: 00000293
RAX: fffff520013a8f41 RBX: 0000000000000000 RCX: ffffffff816b466e
RDX: ffff888029055940 RSI: ffffffff816b467c RDI: 0000000000000007
RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000
R13: ffffffff8dda6a58 R14: ffffffff8dda6a00 R15: ffffc90009d47a08
console_unlock+0x10c/0x260 kernel/printk/printk.c:3036
vprintk_emit+0x17f/0x5f0 kernel/printk/printk.c:2303
vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
_printk+0xc8/0x100 kernel/printk/printk.c:2328
do_blk_trace_setup+0x888/0xaa0 kernel/trace/blktrace.c:590
__blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:644
blk_trace_setup+0x47/0x60 kernel/trace/blktrace.c:662
sg_ioctl_common drivers/scsi/sg.c:1118 [inline]
sg_ioctl+0x669/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f70eba7cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f70ec73a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f70ebbabf80 RCX: 00007f70eba7cda9
RDX: 0000000020000040 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f70ebac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f70ebbabf80 R15: 00007ffdbca452f8
</TASK>

=============================
[ BUG: Invalid wait context ]
6.8.0-rc2-syzkaller-g41bccc98fb79-dirty #0 Tainted: G W
-----------------------------
syz-executor.4/5650 is trying to lock:
ffffffff8d21c348 (relay_channels_mutex){+.+.}-{3:3}, at: relay_close kernel/relay.c:760 [inline]
ffffffff8d21c348 (relay_channels_mutex){+.+.}-{3:3}, at: relay_close+0x36/0x5d0 kernel/relay.c:752
other info that might help us debug this:
context-{2:2}
4 locks held by syz-executor.4/5650:
#0: ffff88801f37c3d0 (&q->debugfs_mutex){+.+.}-{3:3}, at: blk_trace_setup+0x33/0x60 kernel/trace/blktrace.c:661
#1: ffffffff8d19a1c0 (console_lock){+.+.}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1923 [inline]
#1: ffffffff8d19a1c0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x162/0x5f0 kernel/printk/printk.c:2302
#2: ffffffff8d19a230 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:303 [inline]
#2: ffffffff8d19a230 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
#2: ffffffff8d19a230 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
#2: ffffffff8d19a230 (console_srcu){....}-{0:0}, at: console_flush_all+0x12d/0xd60 kernel/printk/printk.c:2959
#3: ffffffff8d1acac0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#3: ffffffff8d1acac0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2184 [inline]
#3: ffffffff8d1acac0 (rcu_callback){....}-{0:0}, at: rcu_core+0x7bd/0x1680 kernel/rcu/tree.c:2465
stack backtrace:
CPU: 0 PID: 5650 Comm: syz-executor.4 Tainted: G W 6.8.0-rc2-syzkaller-g41bccc98fb79-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_lock_invalid_wait_context kernel/locking/lockdep.c:4751 [inline]
check_wait_context kernel/locking/lockdep.c:4821 [inline]
__lock_acquire+0x821/0x3b30 kernel/locking/lockdep.c:5087
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:752
relay_close kernel/relay.c:760 [inline]
relay_close+0x36/0x5d0 kernel/relay.c:752
blk_trace_free+0x37/0x190 kernel/trace/blktrace.c:316
blk_trace_rcu_free+0x22/0x30 kernel/trace/blktrace.c:388
rcu_do_batch kernel/rcu/tree.c:2190 [inline]
rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465
__do_softirq+0x21a/0x8de kernel/softirq.c:553
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu kernel/softirq.c:632 [inline]
irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:console_flush_all+0xa11/0xd60 kernel/printk/printk.c:2973
Code: e8 84 c1 23 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 c2 db 1c 00 48 85 db 0f 85 7c 01 00 00 e8 24 e0 1c 00 fb 48 8b 04 24 <4c> 89 fa 83 e2 07 0f b6 00 38 d0 7f 08 84 c0 0f 85 55 02 00 00 41
RSP: 0018:ffffc90009d478d0 EFLAGS: 00000293
RAX: fffff520013a8f41 RBX: 0000000000000000 RCX: ffffffff816b466e
RDX: ffff888029055940 RSI: ffffffff816b467c RDI: 0000000000000007
RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000
R13: ffffffff8dda6a58 R14: ffffffff8dda6a00 R15: ffffc90009d47a08
console_unlock+0x10c/0x260 kernel/printk/printk.c:3036
vprintk_emit+0x17f/0x5f0 kernel/printk/printk.c:2303
vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
_printk+0xc8/0x100 kernel/printk/printk.c:2328
do_blk_trace_setup+0x888/0xaa0 kernel/trace/blktrace.c:590
__blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:644
blk_trace_setup+0x47/0x60 kernel/trace/blktrace.c:662
sg_ioctl_common drivers/scsi/sg.c:1118 [inline]
sg_ioctl+0x669/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f70eba7cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f70ec73a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f70ebbabf80 RCX: 00007f70eba7cda9
RDX: 0000000020000040 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f70ebac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f70ebbabf80 R15: 00007ffdbca452f8
</TASK>
------------[ cut here ]------------
kernel BUG at mm/vmalloc.c:2864!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5650 Comm: syz-executor.4 Tainted: G W 6.8.0-rc2-syzkaller-g41bccc98fb79-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:vunmap+0x77/0xa0 mm/vmalloc.c:2864
Code: 48 89 ef e8 bb fb ff ff 48 85 c0 48 89 c3 74 1c e8 3e d4 b4 ff 48 89 df e8 76 97 02 00 5b 5d e9 2f d4 b4 ff e8 2a d4 b4 ff 90 <0f> 0b e8 22 d4 b4 ff 90 48 c7 c7 80 e8 d9 8a 48 89 ee e8 d2 c4 7a
RSP: 0018:ffffc90000007d18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000100 RCX: ffffffff81d35224
RDX: ffff888029055940 RSI: ffffffff81d35276 RDI: 0000000000000005
RBP: ffffc9000cea1000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000100 R11: ffffffff8a9228aa R12: ffff88802d70c4a8
R13: fffffbfff1e75f73 R14: ffffed100d9dd408 R15: ffff88806ceea000
FS: 00007f70ec73a6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efc1e7739a0 CR3: 000000006a156000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
relay_destroy_buf+0x6e/0x3e0 kernel/relay.c:199
relay_remove_buf kernel/relay.c:221 [inline]
kref_put include/linux/kref.h:65 [inline]
relay_close_buf+0x153/0x1b0 kernel/relay.c:430
relay_close kernel/relay.c:766 [inline]
relay_close+0x3a8/0x5d0 kernel/relay.c:752
blk_trace_free+0x37/0x190 kernel/trace/blktrace.c:316
blk_trace_rcu_free+0x22/0x30 kernel/trace/blktrace.c:388
rcu_do_batch kernel/rcu/tree.c:2190 [inline]
rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465
__do_softirq+0x21a/0x8de kernel/softirq.c:553
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu kernel/softirq.c:632 [inline]
irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:console_flush_all+0xa11/0xd60 kernel/printk/printk.c:2973
Code: e8 84 c1 23 00 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 c2 db 1c 00 48 85 db 0f 85 7c 01 00 00 e8 24 e0 1c 00 fb 48 8b 04 24 <4c> 89 fa 83 e2 07 0f b6 00 38 d0 7f 08 84 c0 0f 85 55 02 00 00 41
RSP: 0018:ffffc90009d478d0 EFLAGS: 00000293
RAX: fffff520013a8f41 RBX: 0000000000000000 RCX: ffffffff816b466e
RDX: ffff888029055940 RSI: ffffffff816b467c RDI: 0000000000000007
RBP: dffffc0000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000004 R12: 0000000000000000
R13: ffffffff8dda6a58 R14: ffffffff8dda6a00 R15: ffffc90009d47a08
console_unlock+0x10c/0x260 kernel/printk/printk.c:3036
vprintk_emit+0x17f/0x5f0 kernel/printk/printk.c:2303
vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45
_printk+0xc8/0x100 kernel/printk/printk.c:2328
do_blk_trace_setup+0x888/0xaa0 kernel/trace/blktrace.c:590
__blk_trace_setup+0xd8/0x180 kernel/trace/blktrace.c:644
blk_trace_setup+0x47/0x60 kernel/trace/blktrace.c:662
sg_ioctl_common drivers/scsi/sg.c:1118 [inline]
sg_ioctl+0x669/0x2760 drivers/scsi/sg.c:1160
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f70eba7cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f70ec73a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f70ebbabf80 RCX: 00007f70eba7cda9
RDX: 0000000020000040 RSI: 00000000c0481273 RDI: 0000000000000003
RBP: 00007f70ebac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f70ebbabf80 R15: 00007ffdbca452f8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vunmap+0x77/0xa0 mm/vmalloc.c:2864
Code: 48 89 ef e8 bb fb ff ff 48 85 c0 48 89 c3 74 1c e8 3e d4 b4 ff 48 89 df e8 76 97 02 00 5b 5d e9 2f d4 b4 ff e8 2a d4 b4 ff 90 <0f> 0b e8 22 d4 b4 ff 90 48 c7 c7 80 e8 d9 8a 48 89 ee e8 d2 c4 7a
RSP: 0018:ffffc90000007d18 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000100 RCX: ffffffff81d35224
RDX: ffff888029055940 RSI: ffffffff81d35276 RDI: 0000000000000005
RBP: ffffc9000cea1000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000100 R11: ffffffff8a9228aa R12: ffff88802d70c4a8
R13: fffffbfff1e75f73 R14: ffffed100d9dd408 R15: ffff88806ceea000
FS: 00007f70ec73a6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efc1e7739a0 CR3: 000000006a156000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 84 c1 23 00 call 0x23c189
5: 9c pushf
6: 5b pop %rbx
7: 81 e3 00 02 00 00 and $0x200,%ebx
d: 31 ff xor %edi,%edi
f: 48 89 de mov %rbx,%rsi
12: e8 c2 db 1c 00 call 0x1cdbd9
17: 48 85 db test %rbx,%rbx
1a: 0f 85 7c 01 00 00 jne 0x19c
20: e8 24 e0 1c 00 call 0x1ce049
25: fb sti
26: 48 8b 04 24 mov (%rsp),%rax
* 2a: 4c 89 fa mov %r15,%rdx <-- trapping instruction
2d: 83 e2 07 and $0x7,%edx
30: 0f b6 00 movzbl (%rax),%eax
33: 38 d0 cmp %dl,%al
35: 7f 08 jg 0x3f
37: 84 c0 test %al,%al
39: 0f 85 55 02 00 00 jne 0x294
3f: 41 rex.B

Tested on:

commit: 41bccc98 Linux 6.8-rc2
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=101b23a0180000
kernel config: https://syzkaller.appspot.com/x/.config?x=b168fa511db3ca08
dashboard link: https://syzkaller.appspot.com/bug?extid=2373f6be3e6de4f92562
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=11c61befe80000

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