bisecting fixing commit since 8f1c0fd2c84c8bf738b7139d09d4ea53027f47c3 building syzkaller on 76f7fc952d5c6a94c61aa2628568ffddb533272a testing commit 8f1c0fd2c84c8bf738b7139d09d4ea53027f47c3 with gcc (GCC) 10.2.1 20210217 kernel signature: af00bf587b2ca1c3e96b102a03e1c9ba99d40903e67a3e5ca94eabc009a354ac all runs: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault testing current HEAD a14d273ba15968495896a38b7b3399dba66d0270 testing commit a14d273ba15968495896a38b7b3399dba66d0270 with gcc (GCC) 10.2.1 20210217 kernel signature: aba6e8e155fef2ce2296d89567c7f8047ae5d2ebf01c1801d0fca87fdf09a7b0 run #0: crashed: SYZFAIL: wrong response packet run #1: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault run #2: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault run #3: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault run #4: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault run #5: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault run #6: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault run #7: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault run #8: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault run #9: crashed: BUG: sleeping function called from invalid context in do_user_addr_fault revisions tested: 2, total time: 20m49.446956755s (build: 13m28.445383844s, test: 6m42.965001052s) the crash still happens on HEAD commit msg: net: macb: restore cmp registers on resume path crash: BUG: sleeping function called from invalid context in do_user_addr_fault BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1348 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 10215, name: syz-executor.4 2 locks held by syz-executor.4/10215: #0: ffffffff8a96a680 (rcu_read_lock){....}-{1:2}, at: bpf_test_run+0x10b/0xa90 net/bpf/test_run.c:30 #1: ffff88802620dc58 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #1: ffff88802620dc58 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x18d/0xd30 arch/x86/mm/fault.c:1331 Preemption disabled at: [] migrate_disable+0x5e/0x160 kernel/sched/core.c:1751 CPU: 0 PID: 10215 Comm: syz-executor.4 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x93/0xc2 lib/dump_stack.c:120 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:8328 do_user_addr_fault+0x1ad/0xd30 arch/x86/mm/fault.c:1348 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x60/0xc0 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577 RIP: 0010:bpf_prog_e48ebe87b99394c4+0x11/0x530 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 66 90 55 48 89 e5 31 c0 48 8b 47 28 <48> 8b 40 00 8b 80 d0 00 00 00 c9 c3 cc cc cc cc cc cc cc cc cc cc RSP: 0018:ffffc9000178fb48 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000018 RDX: ffffffffa004ead0 RSI: ffffc90000e76048 RDI: ffffc9000178fcb8 RBP: ffffc9000178fb48 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000001 R12: ffffc9000178fc98 R13: ffffc90000e76000 R14: 0000000000000000 R15: ffffc9000178fcb8 bpf_prog_run_xdp include/linux/filter.h:770 [inline] bpf_test_run+0x1d9/0xa90 net/bpf/test_run.c:48 bpf_prog_test_run_xdp+0x284/0x470 net/bpf/test_run.c:646 bpf_prog_test_run kernel/bpf/syscall.c:3132 [inline] __do_sys_bpf+0x1030/0x39e0 kernel/bpf/syscall.c:4411 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3e5004c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465ef9 RDX: 0000000000000028 RSI: 0000000020000440 RDI: 000000000000000a RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffda6d4c75f R14: 00007f3e5004c300 R15: 0000000000022000 BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 11585067 P4D 11585067 PUD 12ee4067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 10215 Comm: syz-executor.4 Tainted: G W 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bpf_prog_e48ebe87b99394c4+0x11/0x530 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 66 90 55 48 89 e5 31 c0 48 8b 47 28 <48> 8b 40 00 8b 80 d0 00 00 00 c9 c3 cc cc cc cc cc cc cc cc cc cc RSP: 0018:ffffc9000178fb48 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000018 RDX: ffffffffa004ead0 RSI: ffffc90000e76048 RDI: ffffc9000178fcb8 RBP: ffffc9000178fb48 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000001 R12: ffffc9000178fc98 R13: ffffc90000e76000 R14: 0000000000000000 R15: ffffc9000178fcb8 FS: 00007f3e5004c700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feb824f3238 CR3: 000000001b8a7000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bpf_prog_run_xdp include/linux/filter.h:770 [inline] bpf_test_run+0x1d9/0xa90 net/bpf/test_run.c:48 bpf_prog_test_run_xdp+0x284/0x470 net/bpf/test_run.c:646 bpf_prog_test_run kernel/bpf/syscall.c:3132 [inline] __do_sys_bpf+0x1030/0x39e0 kernel/bpf/syscall.c:4411 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3e5004c188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000465ef9 RDX: 0000000000000028 RSI: 0000000020000440 RDI: 000000000000000a RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0 R13: 00007ffda6d4c75f R14: 00007f3e5004c300 R15: 0000000000022000 Modules linked in: CR2: 0000000000000000 ---[ end trace 0f19dd2e459174d4 ]--- RIP: 0010:bpf_prog_e48ebe87b99394c4+0x11/0x530 Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 66 90 55 48 89 e5 31 c0 48 8b 47 28 <48> 8b 40 00 8b 80 d0 00 00 00 c9 c3 cc cc cc cc cc cc cc cc cc cc RSP: 0018:ffffc9000178fb48 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000018 RDX: ffffffffa004ead0 RSI: ffffc90000e76048 RDI: ffffc9000178fcb8 RBP: ffffc9000178fb48 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000001 R12: ffffc9000178fc98 R13: ffffc90000e76000 R14: 0000000000000000 R15: ffffc9000178fcb8 FS: 00007f3e5004c700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feb824fa000 CR3: 000000001b8a7000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400