general protection fault in htab_elem_free

general protection fault in htab_elem_free_rcu
Status: upstream: reported C repro on 2020/07/11 17:03
Reported-by: syzbot+a9db0ab6a8e0ca14351d@syzkaller.appspotmail.com
First crash: 284d, last: 124d

Cause bisection: failed (bisect log)

Sample crash report:

general protection fault, probably for non-canonical address 0xf33bb70012bc003b: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x99ddd80095e001d8-0x99ddd80095e001df]
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-rc4-next-20200710-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:htab_elem_free kernel/bpf/hashtab.c:769 [inline]
RIP: 0010:htab_elem_free_rcu+0x4a/0x110 kernel/bpf/hashtab.c:779
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bc 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b f8 48 8d 7d 18 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 82 00 00 00 44 8b 65 18 bf 05
RSP: 0018:ffffc90000007e48 EFLAGS: 00010a03
RAX: dffffc0000000000 RBX: ffff888084800010 RCX: 0000000000000001
RDX: 133bbb0012bc003b RSI: ffffffff8186891e RDI: 99ddd80095e001de
RBP: 99ddd80095e001c6 R08: 0000000000000000 R09: ffffffff8c5b09f7
R10: fffffbfff18b613e R11: 0000000000000000 R12: ffffc90000007ed8
R13: ffff888084800000 R14: 0000000000000000 R15: ffffffff89a86580
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c6368 CR3: 0000000009a79000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_do_batch kernel/rcu/tree.c:2418 [inline]
 rcu_core+0x5dc/0x11d0 kernel/rcu/tree.c:2645
 __do_softirq+0x34c/0xa60 kernel/softirq.c:292
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:387 [inline]
 __irq_exit_rcu kernel/softirq.c:417 [inline]
 irq_exit_rcu+0x229/0x270 kernel/softirq.c:429
 sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1090
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: ff 4c 89 ef e8 93 66 c6 f9 e9 8e fe ff ff 48 89 df e8 86 66 c6 f9 eb 8a cc cc cc cc e9 07 00 00 00 0f 00 2d 34 9b 5b 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 24 9b 5b 00 f4 c3 cc cc 55 53 e8 09
RSP: 0018:ffffffff89a07c70 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff89a86580 RSI: ffffffff87ed2968 RDI: ffffffff87ed293e
RBP: ffff8880a6a93064 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a6a93064
R13: 1ffffffff1340f98 R14: ffff8880a6a93065 R15: 0000000000000001
 arch_safe_halt arch/x86/include/asm/paravirt.h:150 [inline]
 acpi_safe_halt+0x8d/0x110 drivers/acpi/processor_idle.c:111
 acpi_idle_do_entry+0x15c/0x1b0 drivers/acpi/processor_idle.c:525
 acpi_idle_enter+0x3f9/0xab0 drivers/acpi/processor_idle.c:651
 cpuidle_enter_state+0xff/0x960 drivers/cpuidle/cpuidle.c:235
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:346
 call_cpuidle kernel/sched/idle.c:126 [inline]
 cpuidle_idle_call kernel/sched/idle.c:214 [inline]
 do_idle+0x431/0x6d0 kernel/sched/idle.c:276
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:372
 start_kernel+0x9cb/0xa06 init/main.c:1045
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Modules linked in:
---[ end trace 5ce7b44eaacf6c96 ]---
RIP: 0010:htab_elem_free kernel/bpf/hashtab.c:769 [inline]
RIP: 0010:htab_elem_free_rcu+0x4a/0x110 kernel/bpf/hashtab.c:779
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bc 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b f8 48 8d 7d 18 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 82 00 00 00 44 8b 65 18 bf 05
RSP: 0018:ffffc90000007e48 EFLAGS: 00010a03
RAX: dffffc0000000000 RBX: ffff888084800010 RCX: 0000000000000001
RDX: 133bbb0012bc003b RSI: ffffffff8186891e RDI: 99ddd80095e001de
RBP: 99ddd80095e001c6 R08: 0000000000000000 R09: ffffffff8c5b09f7
R10: fffffbfff18b613e R11: 0000000000000000 R12: ffffc90000007ed8
R13: ffff888084800000 R14: 0000000000000000 R15: ffffffff89a86580
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c6368 CR3: 0000000009a79000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (440):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info
ci-upstream-linux-next-kasan-gce-root	2020/07/11 05:15	linux-next	d31958b3	18d18b59	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2020/12/18 05:50	upstream	d64c6f96	04201c06	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/12/16 09:55	upstream	d635a69d	f213e07e	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/12/15 15:58	upstream	148842c9	97183ed7	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/12/07 15:36	upstream	0477e928	1190297f	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/11/25 16:16	upstream	127c501a	1a1f4bd8	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/11/18 02:36	upstream	111e91a6	bd2a760b	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/11/08 23:25	upstream	9dbc1c03	64069d48	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/11/07 15:33	upstream	659caaf6	64069d48	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/11/05 16:38	upstream	4ef8451b	64069d48	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/11/04 19:51	upstream	4ef8451b	cba33199	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/10/30 06:08	upstream	23859ae4	a0c7169a	.config	log	report			info
ci-upstream-kasan-gce-root	2020/10/08 03:46	upstream	c85fb28b	1880b4a9	.config	log	report			info
ci-upstream-kasan-gce-smack-root	2020/10/06 08:59	upstream	7575fdda	1880b4a9	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/09/14 05:06	upstream	e4c26faa	2d3cdd63	.config	log	report
ci-upstream-kasan-gce-root	2020/09/09 20:06	upstream	34d4ddd3	0ea7a887	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/09/09 17:40	upstream	34d4ddd3	0ea7a887	.config	log	report
ci-qemu-upstream-386	2020/08/12 18:47	upstream	00e4db51	0d7bd2e0	.config	log	report
ci-upstream-bpf-kasan-gce	2020/10/14 23:43	bpf	28802e7c	fc7735a2	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/10/01 05:10	bpf	9cf51446	8516f6d3	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/09/27 22:20	bpf	87f92ac4	5dd8aee8	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/09/17 14:08	bpf	642e450b	8247808b	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/09/14 03:31	bpf	fde6dedf	2d3cdd63	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/11 13:09	bpf	fde6dedf	adfb8b4e	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/11 04:00	bpf	746f534a	409809d8	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/10 12:59	bpf	746f534a	409809d8	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/10 05:20	bpf	746f534a	409809d8	.config	log	report
ci-upstream-bpf-kasan-gce	2020/09/09 15:49	bpf	746f534a	0ea7a887	.config	log	report
ci-upstream-net-this-kasan-gce	2020/09/09 05:36	net	843d926b	abf9ba4f	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/10/20 16:32	bpf-next	9ff9b0d3	ff4a3345	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/10/19 18:18	bpf-next	9ff9b0d3	ff4a3345	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/10/17 05:43	bpf-next	9ff9b0d3	6e262c73	.config	log	report			info
ci-upstream-net-kasan-gce	2020/10/12 12:24	net-next	bc081a69	4a77ae0b	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/10/10 21:28	bpf-next	ac53a0d3	4a77ae0b	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/29 23:42	bpf-next	00e8c44a	5abc3f1a	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/29 20:37	bpf-next	00e8c44a	5abc3f1a	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/26 23:39	bpf-next	ba5f4cfe	2d5ea0cb	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/24 00:15	bpf-next	a8a71796	287cd75a	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/20 18:19	bpf-next	70b97111	9564d2e9	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/19 23:26	bpf-next	70b97111	53ce8104	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/19 19:16	bpf-next	70b97111	53ce8104	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/18 23:40	bpf-next	b6ed6cf4	53ce8104	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/17 18:58	bpf-next	c64779e2	8247808b	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/16 16:28	bpf-next	ffa915f4	18d7d030	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/09/12 12:16	bpf-next	2bab48c5	79fb24e2	.config	log	report
ci-upstream-net-kasan-gce	2020/09/10 22:25	net-next	4f6a5caf	409809d8	.config	log	report
ci-upstream-net-kasan-gce	2020/09/10 18:29	net-next	4f6a5caf	409809d8	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/10 16:19	bpf-next	8081ede1	409809d8	.config	log	report
ci-upstream-net-kasan-gce	2020/09/10 12:38	net-next	b599a5b9	409809d8	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/10 08:28	bpf-next	7fb5eefd	409809d8	.config	log	report
ci-upstream-bpf-next-kasan-gce	2020/09/10 00:52	bpf-next	7fb5eefd	409809d8	.config	log	report
ci-upstream-net-kasan-gce	2020/09/09 18:59	net-next	f5499c67	0ea7a887	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/10/01 04:00	linux-next	de69ee6d	8516f6d3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/09/23 20:59	linux-next	dcf2427b	287cd75a	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/07/11 04:48	linux-next	d31958b3	18d18b59	.config	log	report