Public bug reported:
[114160.228398] BUG: kernel NULL pointer dereference, address: 000000000000008c
[114160.232549] #PF: supervisor write access in kernel mode
[114160.236135] #PF: error_code(0x0002) - not-present page
[114160.239636] PGD 0 P4D 0
[114160.242317] Oops: 0002 [#1] SMP NOPTI
[114160.245344] CPU: 360 PID: 1559314 Comm: git Tainted: P O
6.2.0-1018-aws #18~22.04.1-Ubuntu
[114160.251947] Hardware name: Amazon EC2 u-12tb1.112xlarge/, BIOS 1.0
10/16/2017
[114160.257988] RIP: 0010:inherit_task_group.isra.0+0x86/0x190
[114160.262023] Code: 48 89 df e8 5c fd ff ff 49 89 c7 48 3d 00 f0 ff ff 0f 87
85 00 00 00 48 3b 9b 90 00 00 00 0f 84 a1 00 00 00 8b 83 8c 00 00 00 <41> 89 87
8c 00 00 00 48 83 c4 08 31 c0 5b 41 5c 41 5d 41 5e 41 5f
[114160.274384] RSP: 0018:ffffb85df19bbc98 EFLAGS: 00010246
[114160.278273] RAX: 0000000000000000 RBX: ffff92697ecac8a8 RCX:
0000000000000000
[114160.284636] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[114160.290996] RBP: ffffb85df19bbcc8 R08: 0000000000000000 R09:
0000000000000000
[114160.297347] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff99836c44e300
[114160.303728] R13: ffff92697ecac8a8 R14: ffff9967aa4c2000 R15:
0000000000000000
[114160.309843] FS: 00007fd549fd7b80(0000) GS:ffff99a033100000(0000)
knlGS:0000000000000000
[114160.316399] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[114160.320395] CR2: 000000000000008c CR3: 0000090e95404006 CR4:
00000000007706e0
[114160.326153] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[114160.331931] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[114160.337773] PKRU: 55555554
[114160.340584] Call Trace:
[114160.343298] <TASK>
[114160.345814] ? show_regs+0x72/0x90
[114160.348829] ? __die+0x25/0x80
[114160.351723] ? page_fault_oops+0x79/0x190
[114160.354996] ? do_user_addr_fault+0x302/0x630
[114160.358203] ? exc_page_fault+0x81/0x190
[114160.361311] ? asm_exc_page_fault+0x27/0x30
[114160.364535] ? inherit_task_group.isra.0+0x86/0x190
[114160.367995] ? inherit_task_group.isra.0+0x64/0x190
[114160.371432] perf_event_init_context+0x14b/0x260
[114160.374787] perf_event_init_task+0x5c/0xa0
[114160.377993] copy_process+0x682/0x1590
[114160.381050] kernel_clone+0x9d/0x3c0
[114160.384040] __do_sys_clone+0x66/0xa0
[114160.387104] __x64_sys_clone+0x25/0x40
[114160.390350] do_syscall_64+0x59/0x90
[114160.393832] ? irqentry_exit+0x21/0x40
[114160.397061] ? exc_page_fault+0x92/0x190
[114160.400273] entry_SYSCALL_64_after_hwframe+0x73/0xdd
[114160.404066] RIP: 0033:0x7fd549ceab57
[114160.407556] Code: ba 04 00 f3 0f 1e fa 64 48 8b 04 25 10 00 00 00 45 31 c0
31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00
f0 ff ff 77 41 41 89 c0 85 c0 75 2c 64 48 8b 04 25 10 00
[114160.419547] RSP: 002b:00007ffc169b7d18 EFLAGS: 00000246 ORIG_RAX:
0000000000000038
[114160.425773] RAX: ffffffffffffffda RBX: 00007fd54a0df040 RCX:
00007fd549ceab57
[114160.431488] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000001200011
[114160.437215] RBP: 0000000000000000 R08: 0000000000000000 R09:
00007ffc169b7e20
[114160.442979] R10: 00007fd549fd7e50 R11: 0000000000000246 R12:
0000000000000001
[114160.448669] R13: 00007ffc169b7f68 R14: 00007ffc169b7e60 R15:
00007ffc169b7ee0
[114160.454441] </TASK>
[114160.457009] Modules linked in: xt_tcpudp xt_conntrack nft_chain_nat
xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6
nf_defrag_ipv4 xfrm_user xfrm_algo xt_addrtype nft_compat nf_tables libcrc32c
nfnetlink br_netfilter bridge stp llc tls wireguard curve25519_x86_64
libchacha20poly1305 chacha_x86_64 poly1305_x86_64 libcurve25519_generic
libchacha ip6_udp_tunnel udp_tunnel nvme_fabrics overlay sunrpc binfmt_misc
intel_rapl_msr intel_rapl_common intel_uncore_frequency_common zfs(PO)
zunicode(PO) isst_if_common zzstd(O) zlua(O) nfit zavl(PO) crct10dif_pclmul
crc32_pclmul icp(PO) polyval_clmulni zcommon(PO) znvpair(PO) ppdev
polyval_generic ghash_clmulni_intel nls_iso8859_1 sha512_ssse3 aesni_intel
crypto_simd spl(O) cryptd rapl raid0 input_leds psmouse parport_pc ena
i2c_piix4 serio_raw parport mac_hid dm_multipath scsi_dh_rdac scsi_dh_emc
scsi_dh_alua sch_fq_codel msr drm efi_pstore ip_tables x_tables autofs4
[114160.503752] CR2: 000000000000008c
[114160.506639] ---[ end trace 0000000000000000 ]---
[114160.509950] RIP: 0010:inherit_task_group.isra.0+0x86/0x190
[114160.513589] Code: 48 89 df e8 5c fd ff ff 49 89 c7 48 3d 00 f0 ff ff 0f 87
85 00 00 00 48 3b 9b 90 00 00 00 0f 84 a1 00 00 00 8b 83 8c 00 00 00 <41> 89 87
8c 00 00 00 48 83 c4 08 31 c0 5b 41 5c 41 5d 41 5e 41 5f
[114160.524861] RSP: 0018:ffffb85df19bbc98 EFLAGS: 00010246
[114160.528421] RAX: 0000000000000000 RBX: ffff92697ecac8a8 RCX:
0000000000000000
[114160.534223] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[114160.540064] RBP: ffffb85df19bbcc8 R08: 0000000000000000 R09:
0000000000000000
[114160.545817] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff99836c44e300
[114160.551571] R13: ffff92697ecac8a8 R14: ffff9967aa4c2000 R15:
0000000000000000
[114160.557330] FS: 00007fd549fd7b80(0000) GS:ffff99a033100000(0000)
knlGS:0000000000000000
[114160.563383] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[114160.567041] CR2: 000000000000008c CR3: 0000090e95404006 CR4:
00000000007706e0
[114160.572767] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[114160.578502] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[114160.584261] PKRU: 55555554
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2067381
Title:
Crash during clone() on user process while perf is running
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