Hello, syzbot found the following issue on: HEAD commit: 9ff9b0d3 Merge tag 'net-next-5.10' of git://git.kernel.org.. git tree: bpf console output: https://syzkaller.appspot.com/x/log.txt?x=140e3e78500000 kernel config: https://syzkaller.appspot.com/x/.config?x=d13c3fa80bc4bcc1 dashboard link: https://syzkaller.appspot.com/bug?extid=83aa762ef23b6f0d1991 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14113907900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130d3310500000 The issue was bisected to: commit 9df1c28bb75217b244257152ab7d788bb2a386d0 Author: Matt Mullins <mmullins@xxxxxx> Date: Fri Apr 26 18:49:47 2019 +0000 bpf: add writable context for raw tracepoints bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=159e3e78500000 final oops: https://syzkaller.appspot.com/x/report.txt?x=179e3e78500000 console output: https://syzkaller.appspot.com/x/log.txt?x=139e3e78500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+83aa762ef23b6f0d1991@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 9df1c28bb752 ("bpf: add writable context for raw tracepoints") FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 BUG: unable to handle page fault for address: ffffc90000e84030 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD aa000067 P4D aa000067 PUD aa1ee067 PMD a9074067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6879 Comm: syz-executor875 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bpf_dispatcher_nop_func include/linux/bpf.h:644 [inline] RIP: 0010:__bpf_trace_run kernel/trace/bpf_trace.c:2045 [inline] RIP: 0010:bpf_trace_run3+0x145/0x3f0 kernel/trace/bpf_trace.c:2083 Code: f7 ff 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 9f 02 00 00 48 8d 73 38 48 8d 7c 24 28 <ff> 53 30 e8 c3 00 f7 ff e8 fe 32 c3 06 31 ff 89 c3 89 c6 e8 13 fd RSP: 0018:ffffc90005457838 EFLAGS: 00010082 RAX: 0000000000000000 RBX: ffffc90000e84000 RCX: ffffffff817e37b0 RDX: 0000000000000000 RSI: ffffc90000e84038 RDI: ffffc90005457860 RBP: 1ffff92000a8af08 R08: 0000000000000000 R09: ffffffff8d7149a7 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888092df4440 R14: 0000000000000001 R15: ffff8880a8f2e300 FS: 0000000001666880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90000e84030 CR3: 000000009d9ab000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __bpf_trace_sched_switch+0xdc/0x120 include/trace/events/sched.h:138 __traceiter_sched_switch+0x64/0xb0 include/trace/events/sched.h:138 trace_sched_switch include/trace/events/sched.h:138 [inline] __schedule+0x1197/0x2200 kernel/sched/core.c:4520 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4682 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40 vprintk_emit+0x2d7/0x6e0 kernel/printk/printk.c:2029 vprintk_func+0x8d/0x1e0 kernel/printk/printk_safe.c:393 printk+0xba/0xed kernel/printk/printk.c:2076 fail_dump lib/fault-inject.c:45 [inline] should_fail+0x472/0x5a0 lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1194 slab_pre_alloc_hook.constprop.0+0xf4/0x200 mm/slab.h:512 slab_alloc mm/slab.c:3300 [inline] __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x6f/0x360 mm/slab.c:3666 kmalloc include/linux/slab.h:559 [inline] allocate_probes kernel/tracepoint.c:58 [inline] func_remove kernel/tracepoint.c:210 [inline] tracepoint_remove_func kernel/tracepoint.c:297 [inline] tracepoint_probe_unregister+0x1cf/0x890 kernel/tracepoint.c:382 bpf_raw_tp_link_release+0x51/0xa0 kernel/bpf/syscall.c:2734 bpf_link_free+0xe6/0x1b0 kernel/bpf/syscall.c:2327 bpf_link_put+0x15e/0x1b0 kernel/bpf/syscall.c:2353 bpf_link_release+0x33/0x40 kernel/bpf/syscall.c:2361 __fput+0x285/0x920 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:141 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:165 [inline] exit_to_user_mode_prepare+0x20e/0x230 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x7a/0x2c0 kernel/entry/common.c:267 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x441509 Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 8b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd2b2c6888 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000441509 RDX: fffffffffffffffd RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007ffd2b2c68a0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: ffffc90000e84030 ---[ end trace a42c1d698c9da70b ]--- RIP: 0010:bpf_dispatcher_nop_func include/linux/bpf.h:644 [inline] RIP: 0010:__bpf_trace_run kernel/trace/bpf_trace.c:2045 [inline] RIP: 0010:bpf_trace_run3+0x145/0x3f0 kernel/trace/bpf_trace.c:2083 Code: f7 ff 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 9f 02 00 00 48 8d 73 38 48 8d 7c 24 28 <ff> 53 30 e8 c3 00 f7 ff e8 fe 32 c3 06 31 ff 89 c3 89 c6 e8 13 fd RSP: 0018:ffffc90005457838 EFLAGS: 00010082 RAX: 0000000000000000 RBX: ffffc90000e84000 RCX: ffffffff817e37b0 RDX: 0000000000000000 RSI: ffffc90000e84038 RDI: ffffc90005457860 RBP: 1ffff92000a8af08 R08: 0000000000000000 R09: ffffffff8d7149a7 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888092df4440 R14: 0000000000000001 R15: ffff8880a8f2e300 FS: 0000000001666880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90000e84030 CR3: 000000009d9ab000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
