Hello:
This patch was applied to bpf/bpf-next.git (refs/heads/master):
On Thu, 19 Aug 2021 08:52:09 -0700 you wrote:
> Andrii reported that libbpf CI hit the following oops when
> running selftest send_signal:
> [ 1243.160719] BUG: kernel NULL pointer dereference, address: 0000000000000030
> [ 1243.161066] #PF: supervisor read access in kernel mode
> [ 1243.161066] #PF: error_code(0x0000) - not-present page
> [ 1243.161066] PGD 0 P4D 0
> [ 1243.161066] Oops: 0000 [#1] PREEMPT SMP NOPTI
> [ 1243.161066] CPU: 1 PID: 882 Comm: new_name Tainted: G O 5.14.0-rc5 #1
> [ 1243.161066] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
> [ 1243.161066] RIP: 0010:bpf_overflow_handler+0x9a/0x1e0
> [ 1243.161066] Code: 5a 84 c0 0f 84 06 01 00 00 be 66 02 00 00 48 c7 c7 6d 96 07 82 48 8b ab 18 05 00 00 e8 df 55 eb ff 66 90 48 8d 75 48 48 89 e7 <ff> 55 30 41 89 c4 e8 fb c1 f0 ff 84 c0 0f 84 94 00 00 00 e8 6e 0f
> [ 1243.161066] RSP: 0018:ffffc900000c0d80 EFLAGS: 00000046
> [ 1243.161066] RAX: 0000000000000002 RBX: ffff8881002e0dd0 RCX: 00000000b4b47cf8
> [ 1243.161066] RDX: ffffffff811dcb06 RSI: 0000000000000048 RDI: ffffc900000c0d80
> [ 1243.161066] RBP: 0000000000000000 R08: 0000000000000000 R09: 1a9d56bb00000000
> [ 1243.161066] R10: 0000000000000001 R11: 0000000000080000 R12: 0000000000000000
> [ 1243.161066] R13: ffffc900000c0e00 R14: ffffc900001c3c68 R15: 0000000000000082
> [ 1243.161066] FS: 00007fc0be2d3380(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000
> [ 1243.161066] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 1243.161066] CR2: 0000000000000030 CR3: 0000000104f8e000 CR4: 00000000000006e0
> [ 1243.161066] Call Trace:
> [ 1243.161066] <IRQ>
> [ 1243.161066] __perf_event_overflow+0x4f/0xf0
> [ 1243.161066] perf_swevent_hrtimer+0x116/0x130
> [ 1243.161066] ? __lock_acquire+0x378/0x2730
> [ 1243.161066] ? __lock_acquire+0x372/0x2730
> [ 1243.161066] ? lock_is_held_type+0xd5/0x130
> [ 1243.161066] ? find_held_lock+0x2b/0x80
> [ 1243.161066] ? lock_is_held_type+0xd5/0x130
> [ 1243.161066] ? perf_event_groups_first+0x80/0x80
> [ 1243.161066] ? perf_event_groups_first+0x80/0x80
> [ 1243.161066] __hrtimer_run_queues+0x1a3/0x460
> [ 1243.161066] hrtimer_interrupt+0x110/0x220
> [ 1243.161066] __sysvec_apic_timer_interrupt+0x8a/0x260
> [ 1243.161066] sysvec_apic_timer_interrupt+0x89/0xc0
> [ 1243.161066] </IRQ>
> [ 1243.161066] asm_sysvec_apic_timer_interrupt+0x12/0x20
> [ 1243.161066] RIP: 0010:finish_task_switch+0xaf/0x250
> [ 1243.161066] Code: 31 f6 68 90 2a 09 81 49 8d 7c 24 18 e8 aa d6 03 00 4c 89 e7 e8 12 ff ff ff 4c 89 e7 e8 ca 9c 80 00 e8 35 af 0d 00 fb 4d 85 f6 <58> 74 1d 65 48 8b 04 25 c0 6d 01 00 4c 3b b0 a0 04 00 00 74 37 f0
> [ 1243.161066] RSP: 0018:ffffc900001c3d18 EFLAGS: 00000282
> [ 1243.161066] RAX: 000000000000031f RBX: ffff888104cf4980 RCX: 0000000000000000
> [ 1243.161066] RDX: 0000000000000000 RSI: ffffffff82095460 RDI: ffffffff820adc4e
> [ 1243.161066] RBP: ffffc900001c3d58 R08: 0000000000000001 R09: 0000000000000001
> [ 1243.161066] R10: 0000000000000001 R11: 0000000000080000 R12: ffff88813bd2bc80
> [ 1243.161066] R13: ffff8881002e8000 R14: ffff88810022ad80 R15: 0000000000000000
> [ 1243.161066] ? finish_task_switch+0xab/0x250
> [ 1243.161066] ? finish_task_switch+0x70/0x250
> [ 1243.161066] __schedule+0x36b/0xbb0
> [ 1243.161066] ? _raw_spin_unlock_irqrestore+0x2d/0x50
> [ 1243.161066] ? lockdep_hardirqs_on+0x79/0x100
> [ 1243.161066] schedule+0x43/0xe0
> [ 1243.161066] pipe_read+0x30b/0x450
> [ 1243.161066] ? wait_woken+0x80/0x80
> [ 1243.161066] new_sync_read+0x164/0x170
> [ 1243.161066] vfs_read+0x122/0x1b0
> [ 1243.161066] ksys_read+0x93/0xd0
> [ 1243.161066] do_syscall_64+0x35/0x80
> [ 1243.161066] entry_SYSCALL_64_after_hwframe+0x44/0xae
>
> [...]
Here is the summary with links:
- [bpf-next] bpf: fix NULL event->prog pointer access in bpf_overflow_handler
https://git.kernel.org/bpf/bpf-next/c/594286b7574c
You are awesome, thank you!
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