FYI, we noticed the following commit: commit: 543d41bf78792e858e6f6598945d307ff808b7fc ("xdp: Infrastructure to generalize XDP") url: https://github.com/0day-ci/linux/commits/Tom-Herbert/xdp-Generalize-XDP/2... in testcase: trinity with following parameters: runtime: 300s test-description: Trinity is a linux system call fuzz tester. test-url: http://codemonkey.org.uk/projects/trinity/ on test machine: qemu-system-i386 -enable-kvm -smp 2 -m 320M caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-----------------------------------------------------+------------+------------+ | | df6dd79be8 | 543d41bf78 | +-----------------------------------------------------+------------+------------+ | boot_successes | 10 | 0 | | boot_failures | 2 | 12 | | WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page | 2 | 2 | | INFO:suspicious_RCU_usage | 0 | 12 | +-----------------------------------------------------+------------+------------+ [ 6.814497] [ INFO: suspicious RCU usage. ] [ 6.814497] [ INFO: suspicious RCU usage. ] [ 6.814990] 4.10.0-rc7-01379-g543d41b #1 Not tainted [ 6.814990] 4.10.0-rc7-01379-g543d41b #1 Not tainted [ 6.815618] ------------------------------- [ 6.815618] ------------------------------- [ 6.816107] net/core/xdp.c:201 suspicious rcu_dereference_check() usage! [ 6.816107] net/core/xdp.c:201 suspicious rcu_dereference_check() usage! [ 6.817090] [ 6.817090] other info that might help us debug this: [ 6.817090] [ 6.817090] [ 6.817090] other info that might help us debug this: [ 6.817090] [ 6.818000] [ 6.818000] rcu_scheduler_active = 2, debug_locks = 0 [ 6.818000] [ 6.818000] rcu_scheduler_active = 2, debug_locks = 0 [ 6.818778] 1 lock held by swapper/1: [ 6.818778] 1 lock held by swapper/1: [ 6.819213] #0: (xdp_hook_mutex){+.+...}, at: [<c146ed6c>] __xdp_unregister_hooks+0x1c/0x185 [ 6.819213] #0: (xdp_hook_mutex){+.+...}, at: [<c146ed6c>] __xdp_unregister_hooks+0x1c/0x185 [ 6.820199] [ 6.820199] stack backtrace: [ 6.820199] [ 6.820199] stack backtrace: [ 6.820710] CPU: 0 PID: 1 Comm: swapper Not tainted 4.10.0-rc7-01379-g543d41b #1 [ 6.820710] CPU: 0 PID: 1 Comm: swapper Not tainted 4.10.0-rc7-01379-g543d41b #1 [ 6.821530] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 [ 6.821530] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 [ 6.822747] Call Trace: [ 6.822747] Call Trace: [ 6.823052] dump_stack+0x16/0x18 [ 6.823052] dump_stack+0x16/0x18 [ 6.823434] lockdep_rcu_suspicious+0xdb/0xee [ 6.823434] lockdep_rcu_suspicious+0xdb/0xee [ 6.823908] __xdp_unregister_hooks+0x171/0x185 [ 6.823908] __xdp_unregister_hooks+0x171/0x185 [ 6.824421] ? __might_sleep+0x2d/0x86 [ 6.824421] ? __might_sleep+0x2d/0x86 [ 6.824848] xdp_unregister_all_hooks+0x3a/0x3f [ 6.824848] xdp_unregister_all_hooks+0x3a/0x3f [ 6.825398] free_netdev+0x25/0xca [ 6.825398] free_netdev+0x25/0xca [ 6.825801] lance_probe+0x115/0x122 [ 6.825801] lance_probe+0x115/0x122 [ 6.826191] probe_list2+0x20/0x41 [ 6.826191] probe_list2+0x20/0x41 [ 6.826586] net_olddevs_init+0x42/0x4e [ 6.826586] net_olddevs_init+0x42/0x4e [ 6.827037] ? probe_list2+0x41/0x41 [ 6.827037] ? probe_list2+0x41/0x41 [ 6.827448] do_one_initcall+0x3c/0x184 [ 6.827448] do_one_initcall+0x3c/0x184 [ 6.827866] ? repair_env_string+0x12/0x54 [ 6.827866] ? repair_env_string+0x12/0x54 [ 6.828326] ? parse_args+0x24e/0x402 [ 6.828326] ? parse_args+0x24e/0x402 [ 6.828785] ? trace_hardirqs_on+0xb/0xd [ 6.828785] ? trace_hardirqs_on+0xb/0xd [ 6.829235] kernel_init_freeable+0xe1/0x15c [ 6.829235] kernel_init_freeable+0xe1/0x15c [ 6.829729] ? rest_init+0x10e/0x10e [ 6.829729] ? rest_init+0x10e/0x10e [ 6.830134] kernel_init+0xb/0xe5 [ 6.830134] kernel_init+0xb/0xe5 [ 6.830515] ? schedule_tail+0xc/0x4a [ 6.830515] ? schedule_tail+0xc/0x4a [ 6.830925] ? rest_init+0x10e/0x10e [ 6.830925] ? rest_init+0x10e/0x10e [ 6.831343] ret_from_fork+0x21/0x2c [ 6.831343] ret_from_fork+0x21/0x2c [ 6.832026] libphy: Fixed MDIO Bus: probed [ 6.832026] libphy: Fixed MDIO Bus: probed [ 6.832650] arcnet: arcnet loaded [ 6.832650] arcnet: arcnet loaded [ 6.833011] arcnet:rfc1201: RFC1201 "standard" (`a') encapsulation support loaded [ 6.833011] arcnet:rfc1201: RFC1201 "standard" (`a') encapsulation support loaded [ 6.833856] arcnet:arc_rawmode: raw mode (`r') encapsulation support loaded [ 6.833856] arcnet:arc_rawmode: raw mode (`r') encapsulation support loaded [ 6.834641] arcnet:com90xx: COM90xx chipset support [ 6.834641] arcnet:com90xx: COM90xx chipset support [ 7.135493] S3: No ARCnet cards found. [ 7.135493] S3: No ARCnet cards found. [ 7.136044] PPP generic driver version 2.4.2 [ 7.136044] PPP generic driver version 2.4.2 [ 7.136573] PPP BSD Compression module registered [ 7.136573] PPP BSD Compression module registered [ 7.137113] PPP MPPE Compression module registered [ 7.137113] PPP MPPE Compression module registered [ 7.137655] NET: Registered protocol family 24 [ 7.137655] NET: Registered protocol family 24 [ 7.138165] SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256). [ 7.138165] SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256). [ 7.138990] SLIP linefill/keepalive option. [ 7.138990] SLIP linefill/keepalive option. [ 7.139543] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12 [ 7.139543] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12 [ 7.140865] serio: i8042 KBD port at 0x60,0x64 irq 1 [ 7.140865] serio: i8042 KBD port at 0x60,0x64 irq 1 [ 7.141421] serio: i8042 AUX port at 0x60,0x64 irq 12 [ 7.141421] serio: i8042 AUX port at 0x60,0x64 irq 12 To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email Thanks, Xiaolong